Where it appears in the exam
What is it?
Emphasis structures with 'What I need is...' move the informational focus to the front of the sentence. In English it isn't enough to say the same thing in a different order: this structure turns one idea into the centre of the message. The natural instinct is to handle emphasis with intonation or a loose 'the thing that...', so your first reaction is usually to leave the structure open instead of closing it down to the exact form English requires.
Why it matters in the exam
In B2 First it's above all a recognition competency (you read it in formal texts) and a very rewarding resource in Writing and Speaking to sound precise. In Part 4 it appears occasionally, when the key word is WHAT and the transformation asks you to reorganise the focus. If you don't notice that the task is testing focus and not general grammar, you write an acceptable sentence that isn't equivalent, and you lose the answer.
The cognitive trap
"Your instinct drops the linking verb: "What I need more time to finish it""
This is structural incompleteness: your brain reaches the content ("more time") before it closes the structure, so it leaves the clause hanging without the verb that joins it to the focus. The cognitive conflict is real: the what-cleft needs a linking verb (is/was) precisely at the point where the meaning already feels complete.
"What I need is more time to finish it" / not "What I need more time to finish it"
In English, what introduces a complete clause that works as the subject. After it you need the verb is/was to join that clause to the focused information.
Recognition pattern
In the exam, look for the key signal first. The answer follows.
Signals that push you towards a what-cleft
"What she wants is a bit more independence."
"What annoyed him was that nobody had warned him."
"What impressed me most was the way they worked together."
"What I need is to speak to the manager directly."
"What the report shows is the need for clearer rules."
The errors that Cambridge does penalise
"What the team needs a clearer plan."
The linking verb is missing. It's a typical slip because the student reaches the content before remembering to close the structure.
"What the team needs is a clearer plan."
It's correct because the clause with 'what' is complete and the focus falls on 'a clearer plan'.
"That surprised me was how calmly she reacted."
Cambridge penalises it because the what-cleft begins with what, not with that. The instinct reaches for 'that' as the opener, but here 'that' doesn't introduce the subject clause.
"What surprised me was how calmly she reacted."
The clause with what works as the subject and the linking verb was introduces the focus, respecting the past frame.
"What I liked most about the course were the feedback."
After a clause with 'what', the linking verb usually agrees with the idea presented as a single unit. 'The feedback' doesn't take 'were' here.
"What I liked most about the course was the feedback."
The sentence highlights the valued element precisely, within an experience that is already finished.
"What the article shows that small changes can matter."
The student mixes two patterns: a clause with 'what' and a complement clause with 'that', but with no linking verb. The result is ungrammatical.
"What the article shows is that small changes can matter."
The structure presents a conclusion as the main idea, very typical in texts and formal transformations.
Why your brain gets it wrong
The learner's short circuit
Analyse the trap by exam format
The cost of the project worries me more than anything. → ______ the cost of the project.
The clause feels like an ordinary 'that'-clause, so the instinct opens with 'That'. But a what-cleft must begin with 'what': it's 'what' that turns the clause into the subject of the sentence. Open with 'That' and the sentence is left with no proper subject.
What
The key word is WHAT and the clause has to act as the subject before the linking verb — only 'what' can open it.
→ What worries me most is
The opener decides whether the cleft works at all
In Key Word Transformation, the danger is that the clause after the opener sounds right, so you don't notice the first word is wrong. A what-cleft only holds together if it starts with what, which turns the clause into a subject; that can't do that job here.
Strategy
When the key word is WHAT, start the clause with what, then add the linking verb is/was before the focused element. If your answer opens with 'that', it isn't a what-cleft.
Emphasis structures (What I need is...) is 1 of 82
The exam tests 82 grammar competencies across 19 families. Mastering one is the first step. Automating all 82 is passing.
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