The idea: the topic first, the news at the end
An ordinary sentence presents a fact in the natural order: subject, verb, object. A what-cleft divides it into two parts. First comes a what-clause that names the topic (“what I value,” “what is missing”), and after the linking verb is or was comes the news—the element the speaker wants to draw attention to. The facts do not change; only the order of presentation changes.
That is why this construction is called emphatic. The listener hears the topic first and waits briefly, then receives the answer, which is what sounds more prominent. English does not repeat the subject with a pronoun: the focus comes immediately after the linking verb.
What-clause + be + focus: What I need is a break / What matters is the result
- clause —
- A construction with a verb, often with its own subject: when I arrived. A non-finite clause may leave the subject unspoken: to get home.
What this city really lacks is a decent night bus.
What this city really lacks is a decent night bus.
The clause names the topic, while the night bus comes at the end as the news.
What I admire about her is her patience.
What I admire about her is her patience.
The same fact can be stated neutrally, but here the emphasis falls on patience.
Structure: subject clause, linking verb, focus
The initial what-clause functions as the subject of the whole sentence, so is or was comes immediately after it, not a second verb or the pronoun it. Word order inside the clause is direct, as in a statement: what she wanted, not what did she want.
The focus after be can be a noun phrase, an action, or a whole clause with how, why, whether, or that. Is/was often presents the what-clause as one meaningful unit. Are/were is also possible before a plural focus: What we need are more chairs.
What + subject + verb ... + be + noun / infinitive / clause
- subject / S —
- The grammatical subject: who or what the clause is about; the verb agrees with it. In The book was written, the book is the subject, although someone else does the action.
- verb / V —
- A word for an action or state, such as work or be. The pattern determines its form.
- noun —
- A word naming a person, thing or idea: student, book, happiness.
- clause —
- A construction with a verb, often with its own subject: when I arrived. A non-finite clause may leave the subject unspoken: to get home.
- infinitive —
- The base verb form. With to: to work; without to: work. The pattern determines whether to is needed.
What the visitors remember is the view from the tower.
The visitors mainly remember the view from the tower.
The focus is a noun phrase.
What nobody could explain was why the lights kept flickering.
Nobody could explain why the lights kept flickering.
The focus is a why-clause with direct word order.
What the lawyer wanted to know was whether the contract had been signed.
The lawyer wanted to know whether the contract had been signed.
The focus is a whether-clause.
Linking-verb tense: is or was
When describing a completed situation, we often use was: What we found was a small door. If we are now identifying or explaining the result of something in the past, is is possible: What we found is a serious problem. For a current need, What I need is… is natural; for a change up to the present, use What has changed is….
This is not a mechanical rule but a consequence of the meaning. The tense in the clause and after the linking verb can be different, while the linking verb indicates the point in time the speaker is talking about.
What we found was a small door hidden behind the shelves.
We found a small door hidden behind the shelves.
Was naturally preserves the past perspective of this account; choose the linking-verb tense according to the meaning.
What has changed is the price, not the quality.
The price has changed, not the quality.
Present Perfect in the clause, is before the focus.
What will happen next is that the committee votes.
Next, the committee will vote.
For the future, we say what will happen; is comes before the focus clause.
Action in the focus: What … do + is/was + infinitive
To highlight the action itself, the clause contains do, does, or did, and an infinitive comes after the linking verb. This is most often the bare form of the verb; a to-infinitive is also possible, especially when the clause contains to do or want to. Past-tense forms or an -s ending are not used after the linking verb here.
This frame is useful for advice, plans, and describing a sequence of actions: it first names the category (what to do), then gives the actual content of the action.
What + subject + do/does/did + is/was + (to) + verb
- subject / S —
- The grammatical subject: who or what the clause is about; the verb agrees with it. In The book was written, the book is the subject, although someone else does the action.
- verb / V —
- A word for an action or state, such as work or be. The pattern determines its form.
What the pilot did was turn the plane back to the airport.
The pilot turned the plane back to the airport.
The bare form turn follows was.
What I'd like to do is to thank everyone who helped.
I would like to thank everyone who helped.
After to do, the linking verb leads to a to-infinitive.
What you can do is check the timetable online.
You can check the timetable online.
Advice with the bare form check.
A clause as the focus: what happened was, what surprised me was
The focus is often a whole clause, following verbs such as happened, surprised, puzzles, and annoys. The clause is introduced by how, why, whether, or that. In speech, that is often omitted after the linking verb.
Word order in the focus clause is always direct: why nobody asked, not why did nobody ask.
What surprised the investors was that sales had doubled.
The investors were surprised that sales had doubled.
The focus is a that-clause.
What puzzles me is why nobody asked.
What puzzles me is why nobody asked.
The focus is a why-clause with direct word order.
What happened was she simply walked out.
What happened was she simply walked out.
In speech, that has been omitted after was.
Inverted pseudo-cleft: the focus first
In the inverted version, the focus and the clause change places: the focus opens the sentence, then comes the linking verb, and the what-clause finishes it. This order quickly connects the new sentence with the previous one and is often strengthened by the word exactly.
Below, we practise the inverted frame with a noun-phrase focus. To highlight an action, it is usually simpler to begin with What … do…, but do not take this as a ban on all other types of inverted focus.
Focus + is/was + what + subject + verb
- subject / S —
- The grammatical subject: who or what the clause is about; the verb agrees with it. In The book was written, the book is the subject, although someone else does the action.
- verb / V —
- A word for an action or state, such as work or be. The pattern determines its form.
Fresh air is what this room needs.
Fresh air is what this room needs.
The focus fresh air comes first.
A second opinion is exactly what you need.
A second opinion is exactly what you need.
Exactly strengthens the match with the need.
When to use it and when not to
A what-cleft introduces new information, contrasts with an expectation, corrects a mistaken assumption, and announces the main point of a talk. It is suitable in both speech and writing, but if it is used in every sentence, the emphasis disappears. A neutral sentence is often better.
Boundaries with related constructions: emphasis on people, places, and time is provided by an it-cleft (It was … that …), while constructions with all and the thing/reason follow separate rules. Not every sentence with what is a cleft: in What the guide said worried the passengers, the initial clause is simply the subject, and there is no linking verb with a highlighted element. Questions and exclamations with What are not clefts either.
The delay worried the passengers.
The delay worried the passengers.
A neutral presentation of the fact.
What worried the passengers was the delay.
What worried the passengers was the delay.
The same fact, but the delay receives the emphasis.
What the guide said worried the passengers.
What the guide said worried the passengers.
This is not a cleft: the ordinary verb worried comes after the clause.
Traps for learners
The phrase “that... is...” may tempt learners to add it after the clause or open the sentence with that. In English, the linking verb comes immediately after the clause, and the initial word is always what. Also remember the linking verb: leaving out is/was makes the sentence incomplete.
After a do-clause, the action is named with the bare form or with to, not with a past-tense form. The clause itself also keeps direct word order.
What I want to say is that we need a new plan.
What I want to say is that we need a new plan.
Without it and with direct word order.
What matters is the result.
What matters is the result.
A short cleft: clause, is, focus.
Common mistakes
Incorrect:That worries me is the size of the bill.
Correct:What worries me is the size of the bill.
The word that does not introduce the clause “the thing that…”. At the beginning of a cleft, what is required for the meaning “the thing that…”.
Incorrect:What I need it is a long walk.
Correct:What I need is a long walk.
The what-clause what I need is already the subject. The pronoun it repeats it and adds an unnecessary element.
Incorrect:What she did was resigned from the board.
Correct:What she did was resign from the board.
After the linking verb in a cleft with did, the action is named with the bare form (or with to), not in the past tense.
Incorrect:What the team lacks experience with clients.
Correct:What the team lacks is experience with clients.
Without the linking verb is, the clause is not connected to the focus, and the sentence remains incomplete.
Incorrect:What did they offer was a full refund.
Correct:What they offered was a full refund.
Inside a cleft, the clause has direct word order, not question word order.