Cambridge English: Use of English Part 4 Key Word Transformations appears in B2 First (FCE), C1 Advanced (CAE), and C2 Proficiency (CPE). In this task, you rewrite a sentence using a given key word so that the new sentence means the same as the original — testing whether you can express ideas through a range of grammatical structures and lexical patterns, not just the ones you find comfortable.
What Is Key Word Transformations and How Does It Work?
Each item gives you a lead sentence, a single key word in capitals, and a gapped sentence. You must complete the gap using two to five words (B2 First) or three to six words (C1 Advanced and C2 Proficiency) that include the key word exactly as given — no changes to its spelling, tense, or form. The key word must sit inside the gap, not outside it.
| Exam | Gap Length | Items | Marks per Item | Total Marks |
|---|---|---|---|---|
| B2 First | 2–5 words | 6 | 0–2 | 12 |
| C1 Advanced | 3–6 words | 6 | 0–2 | 12 |
| C2 Proficiency | 3–8 words | 6 | 0–2 | 12 |
Scoring is partial: each item is worth two marks and is typically divided into two 'halves'. If your answer captures one correct element but not the other, you receive one mark. This means a completely wrong answer scores zero, a partially right answer scores one, and a fully correct answer scores two.
Which Grammar Structures Are Most Commonly Tested?
Part 4 is not random. Cambridge cycles through a predictable set of structures, especially at B2 and C1 level. Knowing these patterns lets you identify the transformation type the moment you read the key word.
- Causative have/get — key words: HAD, GET (e.g. 'She repaired her roof' → 'She had her roof repaired')
- Reported speech and reporting verbs — SUGGESTED, DENIED, ACCUSED, ADMITTED
- Passive constructions — BEEN, MADE, SAID, REPORTED, BELIEVED
- Modal perfect forms expressing regret or deduction — SHOULD, MUST, NEEDN'T, CAN'T
- Conditionals including inverted forms — HAD, WERE, SHOULD (e.g. 'Should you need help…')
- Comparative and superlative paraphrases — AS, THAN, ENOUGH, TOO
- Phrasal verb ↔ formal verb equivalents — SET OFF / depart, PUT UP WITH / tolerate
- Noun phrase ↔ clause paraphrases — DESPITE, IN SPITE OF, ALTHOUGH, UNLESS
- Wish / if only / would rather — WISH, RATHER, SOONER
- Quantifier and pronoun substitutions — NEITHER, BOTH, EACH, EVERY
Before you write anything, classify the transformation: is the key word a reporting verb, a modal, a conjunction, or a phrasal element? Naming the category takes five seconds and prevents the most common error — using the right word in the wrong structure.
How to Approach Each Item Step by Step
- Read the lead sentence and identify its core meaning — subject, verb, object, and any modifiers.
- Look at the key word and ask: what grammatical category does it belong to, and what structures use it?
- Check the words already in the gapped sentence — the words before and after the gap constrain what can go inside it.
- Draft your answer mentally and count the words. Contractions count as two words (e.g. 'don't' = 'do' + 'not').
- Verify meaning: does your completed sentence mean exactly the same as the lead sentence? Shifts in meaning score zero even if the grammar is perfect.
- Verify form: is the key word unchanged? Is the word count within the allowed range?
Never change the key word. If the key word is MADE, you cannot write 'makes', 'making', or 'make'. The instructions explicitly state the word must be used without any alterations. This is the single most penalised mechanical error in Part 4.
Common Mistakes That Cost Students Marks
What students write (wrong)
- '…had her roof repairing…' (wrong participle after causative)
- '…suggested to go…' (suggest + gerund, not infinitive)
- '…despite she was tired…' (despite + noun/gerund, not clause)
- '…should have gone there' when only one mark element is correct
- Using 6 words when limit is 5 (B2 First), invalidating the answer
- Paraphrasing with near-synonyms that subtly change the meaning
What scores full marks (correct)
- '…had her roof repaired…' (past participle required)
- '…suggested going…' (gerund after suggest)
- '…despite being tired…' or '…despite her tiredness…'
- Ensuring both scorable halves of the answer are correct
- Counting carefully: contractions are two words
- Preserving the exact logical meaning, including negation
How Should You Practise Key Word Transformations Efficiently?
Random drilling is less effective than structured pattern practice. Group your practice by transformation type — spend one session exclusively on reporting verbs, another on modal perfects, another on passive constructions. When you make an error, write out the rule that the correct answer follows, not just the correct answer itself. That rule generalisation is what transfers to unseen items.
Use authentic Cambridge materials: past papers and official practice tests are the most reliable source of item types at the right difficulty. After completing a set, go through every wrong or uncertain item and map it to a specific grammar point. If the same structure appears twice in your error log, that is your priority revision target.
Practise paraphrasing in both directions. If you see 'She asked him to leave' transformed with TOLD, also practise reconstructing the original from 'He was told to leave' — this bidirectional awareness sharpens your understanding of how structures map onto each other.
At C1 Advanced and C2 Proficiency level, the transformations often involve collocation and idiomatic phrasing rather than pure grammar: you may need to know that 'it crossed my mind' is the fixed expression triggered by the key word MIND, or that 'take for granted' is the phrasal element behind GRANTED. Building a reference list of these fixed expressions, organised by key word, gives you direct access to correct answers under timed conditions.
If you are genuinely unsure of an answer, still attempt it. Because scoring is partial, any correct element inside the gap earns one mark. A blank scores zero with certainty; a reasonable attempt has a real chance of one mark.
Memo Chat+ offers targeted practice for Key Word Transformations across all three Cambridge levels, with immediate structured feedback that identifies which grammar rule each error traces back to — accelerating the pattern recognition that this task demands.