Cambridge C2 Key Word Transformations: Meaning and Collocation

Compare these two sentences:

The evidence does not support the claim that the fault was inevitable.

The claim that the fault was inevitable is not borne out by the evidence.

The second sentence changes the grammar and vocabulary but preserves four facts: there is a claim, the claim concerns inevitability, evidence is the standard, and that evidence does not support the claim. It also uses borne, not born.

That is the decision in Cambridge C2 Proficiency Reading and Use of English Part 4, Key word transformations. Cambridge’s current format contains six discrete items. Each has a lead-in sentence, a given key word, and a gapped second sentence. You must complete the gap with three to eight words, including the key word, without changing that key word. Each item carries up to two marks, and the focus is grammar, vocabulary, and collocation.

Use the Cambridge C1/C2 vocabulary hub for the wider route and Exam English for the full exam collection.

Preserve a meaning ledger

Before transforming, list what cannot change:

• actor and object: who did what to whom;
• logical direction: cause to result, evidence to claim, option to exclusion;
• time and aspect: planned, ongoing, completed, or still possible;
• polarity: affirmative, negative, or unable to exclude;
• modality: certain, possible, necessary, or conditional;
• degree and scope: partly, mainly, only, every, or one option;
• commitment state: promised, delayed, carried out, or completed.

Then identify the grammar required by the unchanged key word. Count only the words in the gap. Cambridge says contractions count as two words—for example, don't counts as do not—so include both words in your total.

Six lexical patterns and their boundaries

Boil down to: identify the essential point

Boil down to + noun, gerund, or wh-clause means that a complex matter’s essential issue, cause, or deciding factor is X:

The disagreement boils down to whether the evidence is sufficient.

The to is a preposition, so boils down to decide is wrong. Come down to broadly overlaps and may sound more neutral. Do not invent a contrast unless the item’s grammar or key word determines the pattern.

Stem from: trace an outcome to a source

X stems from Y means X has its source or underlying cause in Y:

The inconsistency stems from a change in the sampling method.

Direction is the main risk. The delay stems from poor planning places delay as outcome and planning as source. It is not passive: is stemmed from is wrong in this causal pattern. If the source is only possible, preserve may, could, or a limiting adverb.

Bear out: evidence supports a prior claim

Evidence bears out a claim means the evidence confirms or supports something previously proposed or uncertain. In the passive, use is/was borne out by, never born out by:

The later figures bore out her forecast.

Her forecast was borne out by the later figures.

The object should be claim-like: a forecast, assumption, concern, account, or prediction—not simply a person. Weak evidence may only support a claim; do not strengthen the source sentence into certainty.

Rule out: exclude an option or possibility

To rule out an option is to remove it from consideration as impossible, unsuitable, or unavailable. The phrasal verb is separable with noun objects—rule the venue out—and requires internal pronoun placement—rule it out.

Negation changes everything: cannot rule out keeps a possibility open. A transformation must not turn that into exclusion.

Follow through on: honour an earlier commitment

To follow through on a commitment is to carry it into action rather than leave it at the intention stage:

She followed through on her promise to send the report.

The expression foregrounds the link between earlier commitment and later action. Follow up on may only mean making further contact or seeking information. A future promise to follow through is not evidence of completion.

Hold off on: postpone without cancelling

The pattern hold off on + noun or gerund postpones starting an action without deciding against it:

They held off on making a decision until Friday.

It is not the same as cancel. The phrase does not provide a duration by itself; preserve the source sentence’s endpoint or condition.

Six original C2-style transformations

These items are original practice, not Cambridge exam material. Each model completion uses the key word unchanged and contains three to eight words.

1. Essential issue

Ultimately, obtaining the owner’s consent is the only thing that matters.

BOILS

Ultimately, it ______ the owner’s consent.

Answer: boils down to obtaining (4 words)

Completed sentence: Ultimately, it boils down to obtaining the owner’s consent. The completion preserves the exclusivity signalled by the only thing that matters. To is followed by a gerund.

2. Principal source

A lack of advance notice is the principal cause of the confusion.

STEMS

The confusion ______ of advance notice.

Answer: stems principally from a lack (5 words)

The completed sentence keeps confusion as the outcome and lack of notice as the source. Principally preserves principal rather than claiming it is the only cause.

3. Evidential support

The later figures confirm Lina’s original prediction.

BORNE

Lina’s original prediction ______ the later figures.

Answer: is borne out by (4 words)

The key word remains BORNE. The passive reverses the grammatical order without reversing the evidential direction. Born would be a spelling error and is not the supplied word.

4. Continuing possibility

It is still possible that the launch will be postponed.

RULE

We cannot ______ postponed.

Answer: rule out the launch being (5 words)

The negative is essential: cannot rule out means postponement remains possible. Dropping cannot or changing it to can would invert the meaning. The gerund-participial clause supplies what remains possible.

5. Honoured promise

Mina kept her promise to send the files before noon.

THROUGH

Mina ______ to send the files before noon.

Answer: followed through on her promise (5 words)

This preserves both the earlier promise and the fact that Mina honoured it. Followed up on her promise would not necessarily show completion of the promised action.

6. Delayed decision

The panel decided not to make a decision before Friday.

HOLD

The panel decided to ______ a decision until Friday.

Answer: hold off on making (4 words)

The completed sentence says the decision is delayed until Friday, not abandoned. The default taught frame is hold off on + gerund.

Mechanical audit of the six answers

Every completion falls within C2’s three-to-eight-word constraint. The word count applies only to the gap, not the fixed words before or after it.

Grammar can be correct while meaning is wrong

Consider this source:

The records may support the supplier’s account.

An inaccurate transformation is:

The supplier’s account is borne out by the records.

The grammar is clean, but may support has become definite confirmation. A meaning-preserving version needs the modal:

The supplier’s account may be borne out by the records.

Now compare:

The disruption stems from the timetable change.

Rewriting it as the timetable change stems from the disruption reverses source and outcome. The same risk appears with rule out: we cannot rule out a delay means the opposite of we can rule out a delay.

Collocation controls the frame

These expressions impose different complements:

• boil down to + noun, gerund, or wh-clause;
• stem from + source noun phrase;
• bear out + claim-like object, or be borne out by + evidence;
• rule out + noun, gerund, or possibility clause;
• follow through on + promise, commitment, plan, or responsibility;
• hold off on + noun or gerund.

A transformation is not finished when the gap looks plausible in isolation. Read the whole second sentence. Followed through her promise lacks on; held off on decide has the wrong complement form; boils down to choose treats a preposition like an infinitive marker.

Common C2 Part 4 errors

• Using C1’s three-to-six-word limit instead of C2’s three to eight.
• Altering the supplied key word’s tense, number, or form.
• Counting fixed words outside the gap.
• Preserving the topic but dropping a modal, negative, degree word, or time limit.
• Reversing cause and result with stem from.
• Writing born out by instead of borne out by.
• Using bear out with a person instead of a claim or prediction.
• Reading cannot rule out as exclusion rather than continuing possibility.
• Treating hold off on as cancel.
• Treating future follow through on as completed action.
• Choosing a grammatical near-synonym that breaks the required collocation.
• Producing a fragment that does not fit the fixed beginning and ending.

Quick count-and-meaning check

Evaluate these completions.

1. The discrepancy may have resulted from a recording error.

STEMS

The discrepancy ______ a recording error. Completion: may stem from (3 words)

This is valid: it preserves possibility and causal direction.

2. We cannot exclude the possibility of another delay.

RULE

We cannot ______ another delay. Completion: rule out the possibility of (5 words)

This is valid: the fixed cannot plus the completion keeps another delay possible.

3. The team did what it had promised.

THROUGH

The team ______ its promise. Completion: followed through on (3 words)

This is valid and complete with the fixed ending. The tense shows later action, not merely an intention.

Fresh practice

Write six transformations, one for each expression in this lesson. For every item, record the source facts in a meaning ledger, draft the completed second sentence, underline the unchanged key word, and count the gap words. Then test the answer adversarially: could a reader interpret a changed time, polarity, direction, degree, or commitment state? If so, revise the frame or add fixed words until the intended answer is fully licensed.

Sources

• C2 Proficiency exam format — Cambridge English
• C2 Proficiency preparation and sample tests — Cambridge English
• C2 Proficiency Part 4 teaching material — Cambridge English
• C2 Proficiency handbook for teachers — Cambridge English

Related

• Cambridge C1 Key Word Transformations: Keep the Meaning
• Cambridge C2 Part 1: Collocations and Shades of Meaning
• Cambridge C2 Open Cloze: Grammar and Fixed Phrases
• Cambridge C2 Vocabulary Precision Beyond C1

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