CAT (Common Admission Test) · Verbal Ability & Reading Comprehension

RC Inference: Must Be True

CAT VARC inference: keep only claims a hostile reader must grant from the quoted lines.

An inference on CAT VARC is a claim the passage forces — smaller than a new story about the world, and different from a sentence the author already wrote out. If a hostile reader can accept every quoted line and still refuse the option, the option is not an inference. Stems that say implies, suggests, can be inferred, or most strongly supports all ask for that forced remainder, not for grammar, idiom, or a main-idea paraphrase. This topic uses one original passage. Colonial foresters in the 1870s blamed charcoal-iron furnaces in the western hills for a sudden thinning of teak. The furnaces did burn wood, and their leases recorded every cartload. The same files also show — and the foresters' published reports rarely repeated — that the hills had already been stripped in two earlier waves: coastal shipyards had taken the largest teak for masts, and shifting cultivators had cleared slopes that later grew only scrub. The ironworks were latecomers. Their offtake was real, but it was the first offtake that left a continuous paper trail. Reformers who read only the published reports therefore treated the most documented user as the decisive one. A later survey of stump ages, never circulated outside the survey office, put the oldest clear-felling decades before the first furnace lease. The survey's author did not deny that furnaces consumed wood; she denied that the consumption explained the teak's disappearance. Reach for this filter on inference stems. Do not use it to hunt a restated fact (that is a detail stem) or to name why a paragraph is there (that is structure). The running passage is historiography, not a news brief: keep the voices separate, and do not upgrade a documented user into the true cause.

CAT (Common Admission Test)
Hard level
6 concepts
12 practice questions

1Forced, stated, or outside

A CAT inference is the leftover that the lines require once you refuse to add a motive, a mechanism, or a future. A stated detail is already on the page — furnaces did burn wood — and repeating it is not inferring. An outside story is anything a well-informed reader might believe (bribery, a hidden owner, a later recovery) that the sentences do not compel.

The test is hostile-reader: grant only the quoted stretch, then ask whether the option can still be refused. On the teak passage, published reports rarely repeated the earlier stripping that the files themselves contained — so typical omission of those waves is forced. That the foresters were paid to protect the furnaces is not.

Three-bin sort

Quote the stretchUnderline the sentence or pair the stem depends on. If you cannot point to it, stop — you are about to invent.
Name the binStated: the option repeats a clause. Forced: the option is the smallest claim those clauses require. Outside: motive, later event, or world fact the stretch never supplies.
Keep forced onlyOn an implies / suggests / inferred stem, the stated bin is a trap that feels safe, and the outside bin is a trap that feels smart. Only the forced bin is the key.

Stated, forced, outside
Bin	What it is	Teak-passage instance
Stated	Already written; a detail stem's home	The furnaces did burn wood
Forced	Hostile reader must grant it from the stretch	Published reports typically omitted the earlier waves the files held
Outside	Plausible in the world; not required by the lines	Foresters hid the waves because the ironworks paid them

Stretch: "The furnaces did burn wood, and their leases recorded every cartload. The same files also show — and the foresters' published reports rarely repeated — that the hills had already been stripped in two earlier waves." Which option is a valid inference, not a restated detail and not an outside story?

The furnaces burned wood.
Published forest reports typically left out the earlier stripping that the files themselves contained.
The foresters hid the earlier waves because they were paid by the ironworks.
Shifting cultivators were the sole cause of the teak's disappearance.

Files contained the earlier waves, and published reports rarely repeated that content, so typical omission is forced. "The furnaces burned wood" is already stated — a detail, not an inference. Payment by the ironworks is an unstated motive. "Sole cause" upgrades one of two named waves into an exclusive explanation the stretch never gives.

2Many keys join two sentences

CAT inference keys are often not sitting in one sentence. One line gives a fact (the ironworks were latecomers); another gives a second fact (theirs was the first offtake with a continuous paper trail); a third draws the reformers' move (they treated the most documented user as decisive). The forced claim is the join: documentation, not being first to cut, is what made the furnaces look like the cause to readers of the published reports.

If an option is fully paid for by a single clause, it is usually too small for a join stem — or it is a detail wearing inference clothes. If it needs a third fact the passage never wrote, it is a leap. The live key uses both (or all three) of the named stretches and nothing else.

Figure. Latecomer plus first continuous trail identifies the ironworks as the late but documented user; reformers who read published reports then treat that user as decisive. 'Offtake was real' is paid by one clause alone.

Join test

Split the optionWrite the option as two or three short claims. Ask which sentence pays for each claim.
Need bothIf every claim is paid for by the same one sentence, the option is not using the join the stem is testing. If any claim has no paying sentence, drop the option.
No extra gearA join still cannot import a cause, a motive, or an "always" rule. Two true sentences plus an invented mechanism is still outside.

Keep the inference the join forces

Teak passage: 'The ironworks were latecomers. Their offtake was real, but it was the first offtake that left a continuous paper trail. Reformers who read only the published reports therefore treated the most documented user as the decisive one.' Which option is forced by joining the latecomer and paper-trail claims, not by one clause and not by an added rule? (A) the ironworks consumed some wood; (B) documentation, not being first to cut, is what made the furnaces look decisive to those reformers; (C) a continuous paper trail always identifies the true cause; (D) the reformers measured stump ages themselves.

A, consumed some woodpaid by 'offtake was real' alone; too small for a join, reject
C, a trail always identifies the causean 'always' rule the passage never grants, reject as an upgrade
D, reformers measured stump agesstump ages belong to a later uncirculated survey, reject as the wrong stretch
B, documentation, not priority, drove the verdictuses latecomer plus first-trail plus the therefore-clause, keep as the join

Pro tip. A join key needs every clause paid for by a named sentence; if one clause has no paying sentence it is a leap, and if all clauses lean on a single clause it is too small.

Stretch: "The ironworks were latecomers. Their offtake was real, but it was the first offtake that left a continuous paper trail. Reformers who read only the published reports therefore treated the most documented user as the decisive one." Which inference needs both the latecomer claim and the paper-trail claim?

The ironworks consumed some wood.
Reformers treated the ironworks as decisive because published reports made the late, well-recorded user look like the main one.
A continuous paper trail always identifies the true cause of deforestation.
Reformers measured stump ages before they blamed the furnaces.

Latecomer plus first continuous trail identifies the ironworks as the late but documented user; the therefore-clause then ties published-report readers to treating that user as decisive — the join. Wood consumption is paid for by "offtake was real" alone. "Always identifies the true cause" is an extreme rule the author does not grant. Stump ages belong to a later uncirculated survey, not to the reformers.

3Quantifiers license less than they seem

Words such as some, most, the largest, rarely, only, and two waves are not decoration. Each one licenses a narrow remainder and blocks a stronger twin. "The largest teak" forces that some of the biggest trees went to shipyards; it does not force that every teak tree went, or that no teak remained for later users.

The usual CAT upgrade is some → all, rarely → never, two waves → the one the option likes, or treated as decisive → was decisive. Keep the quantifier you actually read. If the option silently swaps it, the option is not forced.

Quantifier lock

Circle the limiterMark some / most / all / only / rarely / largest / two / later. That word is the claim's ceiling.
Try the upgradeRead the option with all, never, sole, or every in mind. If that is what it is smuggling, it is not forced.
Keep the ceilingThe live inference stays at or under the limiter: some of the largest teak, not all teak; rarely omitted, not never printed.

Quantifier ceilings
Passage limiter	What it licenses	Upgrade the key must refuse
the largest teak	At least some of the biggest trees went to shipyards	Every teak tree went to shipyards
rarely repeated	Published reports typically omitted that content	The files were never published in any form
two earlier waves	At least shipyards and cultivators had already cut	Only one of those groups removed any teak
treated as the decisive one	Reformers assigned decisiveness to the documented user	The documented user was in fact the cause

Stretch: "the hills had already been stripped in two earlier waves: coastal shipyards had taken the largest teak for masts, and shifting cultivators had cleared slopes that later grew only scrub." Which inference stays under the quantifiers?

Shipyards took every teak tree in the hills.
At least some of the biggest teak went to coastal shipyards for masts.
Only shipyards, not cultivators, removed any teak.
No teak of any size remained after the shipyard wave.

"The largest teak" licenses some of the biggest trees, not every tree and not a wiped hillside. "Every teak tree" upgrades largest to all. "Only shipyards" erases the cultivator wave the same sentence names. "No teak remained" cannot stand beside later furnace offtake, and "largest" never meant "all that was left".

4Cause, proof, and extreme verbs

Inference options often smuggle a stronger verb than the passage used. Caused, proves, will, always, and never are the usual upgrades. The teak survey's author did not deny that furnaces consumed wood; she denied that the consumption explained the teak's disappearance. That forces a claim about explanation, not a claim that furnaces did no harm of any kind, and not a claim that stump ages prove a universal negative.

Treat as, blamed, and explained are different verbs. Foresters blamed furnaces; reformers treated the documented user as decisive; the survey author denied an explanation. Swapping those verbs is how a half-right option gets written. If the passage withholds the causal link, you must withhold it too — even when the story would be tidy.

Figure. The survey author denied that furnace wood-use explained the teak loss. That forces a scoped denial, not 'consumed no wood', not a proof of no damage, and not a motive to expand furnaces.

Verb check

Copy the verbWrite the passage's verb: blamed, treated as, explained, denied, recorded. Do not replace it with caused or proved unless that word is there.
Spot the upgradeCaused / proves / always / never / sole / will remain are red unless the stretch is already that absolute.
Keep the denial's scopeDenying that wood-use explained the loss is not denying that wood was used, and not proving that furnaces were harmless.

Refuse the verb upgrade

Teak passage: 'The survey's author did not deny that furnaces consumed wood; she denied that the consumption explained the teak's disappearance.' Which option keeps the passage's verb and scope? (A) on her account, furnace wood-use was not the explanation of the teak loss; (B) furnaces consumed no wood; (C) stump ages prove the ironworks caused no damage of any kind; (D) the survey author wanted the furnaces expanded.

B, consumed no woodcontradicts the first half of the same sentence, reject
C, proves no damage of any kindupgrades a scoped denial to a universal proof, reject as extreme
D, wanted furnaces expandedan unstated motive, reject as outside
A, wood-use was not the explanationmatches 'denied that the consumption explained', keep

Pro tip. Denying that a cause explains an effect is not denying the effect; copy the passage's verb (denied, explained) rather than upgrading it to caused or proves.

Stretch: "The survey's author did not deny that furnaces consumed wood; she denied that the consumption explained the teak's disappearance." Which inference is forced?

Furnace wood-use was not, on her account, the explanation of the teak loss.
Furnaces consumed no wood.
Stump-age evidence proves the ironworks caused no damage of any kind.
The survey author wanted the furnaces expanded.

Denying that consumption explained the disappearance forces that, on her account, wood-use was not the explanation. "Consumed no wood" contradicts the first half of the same sentence. "Proves… no damage of any kind" upgrades a scoped denial into a universal proof. Wanting expansion is an unstated motive.

5Whose voice does the stem ask for?

A passage can force a claim about what foresters blamed, what reformers treated as decisive, what the survey author denied, or what the passage itself presents as the corrective record. Those are four different owners. An option that is true of the foresters is not thereby an inference about the author, and an option that reports the reformers' move is not an endorsement of that move.

CAT stems that say the author implies or the passage suggests want the writer's remainder, not a cited party's slogan. Stems that name a group ("the reformers", "the foresters") want that group's remainder. Mixing the two is how a correct local sentence becomes a wrong inference.

Voice lock

Name the ownerDoes the stem ask for the author, the passage as a whole, or a named group? Circle that owner before you read options.
Tag each optionMark whose mouth the option is speaking from. If the tag is not the stem's owner, the option is off-voice even when the sentence is true of someone else.
Endorsement is extraReporting that reformers treated X as decisive does not force that the author thinks X was decisive. The teak passage presents that treatment as a therefore that follows from a partial reading.

Voices in the teak passage
Voice	What that voice does	Off-voice trap
Foresters	Blamed furnaces for a sudden thinning of teak	Treat their blame as the passage's conclusion
Reformers	Treated the most documented user as decisive after reading only published reports	Credit them with the uncirculated stump-age survey
Survey author	Accepts wood-use; denies it as the explanation of the loss	Read her as denying that furnaces burned any wood
Passage	Sets the survey against published-report reformers; does not re-blame a new sole cause	Take "treated as decisive" as the author's own verdict

Stretch: "Colonial foresters in the 1870s blamed charcoal-iron furnaces… Reformers who read only the published reports therefore treated the most documented user as the decisive one." What does the passage imply about those reformers?

The reformers independently measured stump ages.
The reformers' conclusion tracked what the published reports made visible, not a full reading of the files.
The foresters privately agreed the ironworks were innocent.
The passage author endorses the reformers' verdict as correct.

"Read only the published reports therefore treated the most documented user as decisive" forces that their verdict followed visibility in those reports, not the fuller files. Stump ages belong to a later survey, not to the reformers. Foresters blamed furnaces — they did not privately acquit them. The therefore-clause presents the reformers' move as a consequence of a partial reading, not as the author's endorsed verdict.

6EXCEPT stems and the negation test

A cannot-be-inferred or EXCEPT stem flips the job: three options are forced remainders, and the key is the one a hostile reader can still refuse. Students who keep hunting for the "best" inference will key a true join and miss the planted outsider. Read the stem's not / except / least before you fall in love with a sharp option.

The negation test is the other side of the same coin. Negate the option. If the passage can still stand, the option was never forced. If the negated option collides with a quoted line, the option was doing real work. Use that test when two options both look modest; it is slower than a first-pass sort, and it is what separates a must-be-true from a could-be-true.

Flip and negate

Read the flipIf the stem says EXCEPT, cannot be inferred, or least, you are hunting the outsider, not the best remainder.
Park the three forcedFor each option, ask whether a hostile reader must grant it. Mark the ones that pass. The leftover is the EXCEPT key.
Negate the close pairWhen two options both look modest, negate each. The one whose denial still sits beside the passage was never must-be-true.

Stem flip cues
Stem cue	What you keep	What you are hunting
implies / suggests / can be inferred	The forced remainder	Stated details and outside stories
EXCEPT / cannot be inferred	Three forced remainders as discards	The option a hostile reader can still refuse
most strongly supports	The remainder with the tightest textual payment	A tidy cause the lines never paid for

From the teak passage, which statement CANNOT be inferred?

The oldest clear-felling, on the uncirculated survey, predated the first furnace lease.
The reformers the passage describes used published reports rather than the stump-age survey.
The survey author accepted that furnaces used wood and rejected wood-use as the explanation of the teak loss.
Every coastal shipyard in the 1870s was owned by the same firm that ran the furnaces.

Stump ages before the first lease, reformers limited to published reports, and the survey author's scoped denial are all paid for by named sentences. Shared ownership of shipyards and furnaces is an outside story: negate it and the passage still stands, so it was never forced. The EXCEPT key is the option a hostile reader can refuse.

Notes

Stated, forced, or outside: An inference is the smallest claim the quoted lines require. A clause already written on the page is a detail rather than an inference, and a plausible story the sentences never compel is outside the passage. The working test is hostile-reader: grant only the quoted stretch, then ask whether the option can still be refused.
Many keys join two sentences: CAT inference keys often sit across two or three sentences rather than one. If every part of an option is paid for by the same single clause it is usually too small for the stem; if any part has no paying sentence at all, it is a leap.
Quantifiers set a ceiling: Some, most, largest, rarely, only and two are limits, not decoration. The usual upgrade is some to all, rarely to never, or "treated as decisive" to "was the cause". Keep the limiter you actually read.
Do not upgrade the verb: Blamed, treated as, explained, recorded and denied are different verbs. Caused, proves, always and never are red unless the stretch is already that absolute, and denying that a cause explains an effect is not denying the effect.
Voice locks, and EXCEPT flips the job: A claim true of a cited group is not thereby an inference about the author. On a cannot-be-inferred or EXCEPT stem three options are forced remainders and the key is the one a hostile reader can still refuse; negating an option that leaves the passage standing shows it was never forced.

Formulas

Inference bar: the smallest claim the quoted lines force. Already written on the page is a detail; merely plausible is outside the passage.
Hostile-reader test: grant only the quoted stretch, then ask whether a hostile reader could still refuse the option. If yes, it is not forced.
Keys usually span two or three sentences: if every part of an option is paid for by one clause it is too small for the stem; if any part has no paying sentence it is a leap.
Keep the limiter: some, most, largest, rarely, only and two set a ceiling. Some to all, rarely to never, and "treated as decisive" to "was the cause" are the standard upgrades.
EXCEPT and cannot-be-inferred stems flip the job: three options are forced remainders and the key is the one that can still be refused.

Exam traps & shortcuts

If you can quote a clause that says the option almost word for word, it is a detail and the stem wanted the forced claim instead.
Watch for the silent upgrade: "treated as decisive" becoming "was the cause", or "rarely" becoming "never".
A claim true of a cited group is not an inference about the author. Check the attribution before granting it.
Denying that a cause explains an effect is not denying the effect — options exploit that gap constantly.
On EXCEPT and cannot-be-inferred stems, negate each option: the one that leaves the passage standing was never forced, and that is the key.

Reference tables

Use this sheet on implies / suggests / inferred stems. Name the stretch, lock the quantifier and the verb, then name the voice. A tidy cause the lines never paid for is not a key.

Inference night-before
Check	Keep	Kill
Bin	Forced remainder	Restated detail; outside motive or later event
Join	Option paid for by the named pair of sentences	One-clause restatement; third fact the passage never wrote
Quantifier	Some / largest / rarely / two at their ceiling	Silent upgrade to all / never / sole / every
Verb	Blamed, treated as, explained, denied — as written	Caused, proves, always, never, will remain
Voice	The stem's owner: author, passage, or named group	A true sentence spoken by the wrong mouth
EXCEPT	The option a hostile reader can still refuse	Keying the sharpest true remainder

Recap

Keep these on exam day; each one kills a planted CAT inference distractor.

Hostile reader: If you can accept the quoted lines and still refuse the option, it is not an inference.
Stated ≠ inferred: A clause already on the page is a detail trap on an implies stem.
Join both: Many keys need two sentences; one true clause is usually too small, a third invented fact is a leap.
Quantifier ceiling: Largest is not all; rarely is not never; treated as decisive is not was the cause.
Verb lock: Do not upgrade blamed / treated as / explained into caused or proves.
Voice lock: A reformers' move is not the author's verdict; EXCEPT hunts the option the passage can still survive.

Practise RC Inference: Must Be True

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