Cleft sentences and other emphasis structures are among the most powerful tools in advanced English. They allow a speaker or writer to highlight one particular piece of information — a person, a time, a reason, an action — by restructuring the sentence around it. Native speakers use these structures constantly in both speech and writing, yet they are rarely taught explicitly at lower levels. At B2 and C1 level, Cambridge exams and IELTS expect learners to produce them confidently. Understanding how each structure works, and why it creates emphasis, will dramatically improve the sophistication of your English.
It-Cleft Sentences
The it-cleft is the most common cleft structure in English. It splits a basic sentence into two clauses, placing the focused element after It is / It was and introducing the rest of the sentence with a relative clause using who, that or which. The focused element can be a person, a thing, a time, a place or a reason.
- Neutral: John broke the window.
- Focus on person: It was John who broke the window.
- Focus on object: It was the window that John broke.
- Focus on time: It was last night that the window was broken.
- Focus on reason: It was because he was angry that John broke the window.
The tense of be changes to match the time reference of the sentence. Use who for people and that for things, times and reasons. That can also be used for people in informal contexts.
Wh-Cleft (Pseudo-Cleft) Sentences
The wh-cleft (also called a pseudo-cleft) uses a what-clause as the subject, followed by be and the focused element. This structure is particularly common in spoken English to emphasise what someone needs, wants, does or feels. Unlike the it-cleft, the wh-cleft allows a whole verb phrase or clause to be focused.
- What I need is a good dictionary.
- What she did was apologise immediately.
- What surprised me most was his reaction.
- What we want is for everyone to be honest.
The reversed pseudo-cleft places the focused element first: A good dictionary is what I need. This variant is common in written English when the focused element is long or complex.
Fronting Adverbials for Emphasis
Fronting moves an adverbial phrase or clause to the front of the sentence to give it prominence. Unlike inversion, fronting does not change the word order of the subject and verb — it simply repositions the adverbial. It is very common in academic and journalistic writing.
- Normal: The economy recovered slowly over the next decade.
- Fronted: Over the next decade, the economy recovered slowly.
- Normal: She finally admitted the truth after years of silence.
- Fronted: After years of silence, she finally admitted the truth.
Do-Emphasis
The auxiliary do / does / did can be added to an affirmative sentence to emphasise the truth of the statement. This structure is particularly useful when contradicting a doubt, a denial or a negative expectation. The main verb remains in its base form after the emphatic auxiliary.
- I do think you should reconsider. (emphasis on sincerity)
- She does know the answer, despite what she says.
- He did apologise — I heard him myself.
Stress the auxiliary in speech: I DO think. In writing, the emphasis is conveyed by the structure alone.
Inversion for Emphasis
Formal inversion places a negative or limiting adverbial at the start of the sentence, triggering subject-auxiliary inversion. This structure appears frequently in academic and literary writing and in the Cambridge C1/C2 writing tasks. Common triggers include never, rarely, seldom, not only…but also, hardly…when, no sooner…than, only then, under no circumstances.
- Never have I seen such dedication.
- Rarely does she arrive on time.
- Not only did he lie, but he also covered it up.
- Hardly had she sat down when the phone rang.
- Under no circumstances should you share your password.
Form and Structure at a Glance
| Structure |
Pattern |
Example |
| It-cleft |
It + be + [focus] + who/that + rest |
It was Maria who called. |
| Wh-cleft |
What + clause + be + [focus] |
What I need is more time. |
| Reversed wh-cleft |
[Focus] + be + what + clause |
More time is what I need. |
| Fronting |
[Adverbial], + subject + verb |
In the morning, we left. |
| Do-emphasis |
Subject + do/does/did + base verb |
She did warn us. |
| Inversion |
Negative adv. + auxiliary + subject + verb |
Never have I seen this. |
Common Mistakes
1. Wrong relative pronoun in an it-cleft
✗ It was the book which I enjoyed the most that she recommended.
✓ It was the book that she recommended which I enjoyed the most.
Keep the cleft structure clean: one focused element, one relative clause.
2. Using a finite verb instead of a base form after emphatic do
✗ She does knows the answer.
✓ She does know the answer.
After do / does / did, always use the bare infinitive (base form).
3. Forgetting inversion after a negative fronted adverbial
✗ Never I have seen such chaos.
✓ Never have I seen such chaos.
The auxiliary must come before the subject when a negative adverbial is fronted.
4. Using a wh-cleft with a non-action focus
✗ What is surprising is she left.
✓ What is surprising is that she left. / What surprised me was her departure.
Use that when the focused element is a full clause, not a noun phrase.
Practice Exercises
See also: English Grammar Guide and Inversion Practice.
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Frequently Asked Questions
What is a cleft sentence in English?
A cleft sentence splits a simple sentence into two clauses so that one element receives special emphasis. The most common type is the it-cleft: instead of saying 'John broke the window', you say 'It was John who broke the window', foregrounding John as the focus. Cleft sentences do not change the meaning of the original sentence — they change what the speaker wants the listener to pay attention to. They are widely used in both spoken and written English at B2 and C1 level.
What is the difference between an it-cleft and a wh-cleft?
An it-cleft uses the pattern 'It + be + [focused element] + who/that + rest of sentence': It was Maria who called. A wh-cleft (pseudo-cleft) uses the pattern 'What + clause + be + [focused element]': What I need is more time. The key difference is what can be focused: an it-cleft typically highlights a noun phrase (a person, thing, time or reason), while a wh-cleft is especially good at focusing a verb phrase or action — what someone did, needs or wants. Both structures are tested at Cambridge B2/C1 level.
How do I use 'who' and 'that' in an it-cleft sentence?
Use 'who' when the focused element is a person: It was Sarah who organised the event. Use 'that' when the focused element is a thing, a time, a place or a reason: It was the deadline that caused the problem. It was in Paris that they first met. It was because of the weather that the match was cancelled. In informal spoken English, 'that' can also be used for people: It was Sarah that called — but 'who' is more formal and preferred in writing.
What is a pseudo-cleft (reversed wh-cleft) sentence?
A reversed pseudo-cleft (or reversed wh-cleft) places the focused element at the beginning rather than at the end: instead of 'What I need is a holiday', you say 'A holiday is what I need.' This variant is common in formal writing and gives weight to the focused element by making it the subject of the sentence. It is also natural in speech when the speaker wants to confirm or contradict something: 'A holiday? A holiday is what I need — not extra work.' Both the standard and reversed pseudo-cleft are useful for adding variety and emphasis in C1 writing tasks.
When do I use emphatic 'do', 'does' or 'did'?
Add the auxiliary do/does/did (stressed) to an affirmative sentence to emphasise that the action really happened or really applies — often to contradict a doubt or a negative. Use do with I/you/we/they in the present: I do enjoy classical music. Use does with he/she/it in the present: She does work hard. Use did for all persons in the past: He did warn you. After the emphatic auxiliary, the main verb is always in the bare infinitive (base form): do know, does think, did apologise — never did knows or does thinks.
What is fronting and how is it different from inversion?
Fronting moves an element (usually an adverbial phrase, an object or a complement) to the front of the sentence to give it prominence, but the subject and verb keep their normal order: 'In the corner sat an old cat' — here 'in the corner' is fronted. Inversion goes further: when certain negative or limiting adverbials are fronted (never, rarely, hardly, not only, under no circumstances), the subject and auxiliary swap positions, creating subject-auxiliary inversion: 'Never have I seen this' (not 'Never I have seen this'). Fronting without inversion is more common in academic prose; inversion with negative adverbials is a key C1/C2 stylistic feature.
Which negative adverbials trigger inversion?
Common negative and limiting adverbials that trigger subject-auxiliary inversion when fronted include: never, rarely, seldom, scarcely, barely, hardly (when/before), no sooner (than), not only (but also), not until, only then, only when, only after, in no way, under no circumstances, on no account, at no time, little (did I know), so + adjective (So difficult was the task that...). After the adverbial, use the appropriate auxiliary + subject + main verb: Rarely does she complain. Not only did he fail the test, but he also missed class.
Are cleft sentences used in formal or informal English?
Cleft sentences appear in both formal and informal contexts, but the type varies. The it-cleft is common across all registers — in conversation, journalism and academic writing alike. The wh-cleft is particularly common in spoken English and informal writing: 'What I really want is a coffee.' Inversion is predominantly a feature of formal written English — academic articles, official documents and literary texts. Do-emphasis is very natural in speech but can also appear in persuasive writing. For Cambridge C1 writing tasks, it-clefts and inversion after negative adverbials are especially valued.
Can cleft sentences be used in questions and negatives?
Yes. It-cleft questions invert the auxiliary and subject in the it-clause: Was it John who called? Wasn't it last Tuesday that the meeting was held? Negative it-clefts place 'not' after 'be': It was not the price that worried me — it was the quality. Wh-cleft negatives typically negate the main verb in the what-clause: What I didn't expect was his resignation. These negative and interrogative forms are useful for adding nuance and focus in both writing and conversation.
How can I practise cleft sentences to prepare for Cambridge C1 Advanced?
The best approach is a combination of recognition and production. First, learn to spot cleft and emphasis structures in authentic texts — news articles, academic writing, Cambridge exam model answers. Then practise transformation exercises: take a neutral sentence and rewrite it using an it-cleft, a wh-cleft and an inverted form. Use LexFizz's Complete the Sentence and Cloze Dropdown exercises to practise in context. For the Cambridge C1 Writing tasks (essay, report, proposal, letter), deliberately include one or two cleft structures and one inversion to demonstrate range. Review your work to confirm the relative pronoun (who vs that), the tense of 'be', and the base form after emphatic 'do'.