Phrases Clivées: c'est ... qui / c'est ... que

A cleft sentence is a normal clause split open to highlight one of its elements. Pierre l'a fait (Pierre did it) becomes C'est Pierre qui l'a fait (it's Pierre who did it). Je lis ce livre (I'm reading this book) becomes C'est ce livre que je lis (it's this book I'm reading). The information content stays the same; what changes is which constituent the speaker is pointing at — which element answers an unspoken question.

This page treats cleft sentences as a sentence type. The c'est X qui/que construction has its own dedicated page in the Complex Grammar section, where the full inventory of variants — dont, où, agreement issues, the ce qui... c'est variant — is laid out. Here the focus is on the cleft as a kind of sentence: when to use it, what work it does, how it differs from related strategies, and how it sits alongside the unmarked declarative.

Why French clefts so much

English has clefts (it's Pierre who did it) but uses them sparingly. The reason is that English prosody is flexible: speakers can shift stress onto any word in a sentence to mark focus. PIERRE did it — with stress on Pierre — is enough. No structural rearrangement is needed.

French prosody works differently. Words within a phrase get relatively even stress, with the strongest beat falling on the final syllable of a phrase. A French speaker who tries to stress an internal word the way an English speaker does sounds strained or theatrical. To put focus on a particular element, French has to rearrange the sentence — and clefting is the dominant rearrangement strategy.

What looks heavy and emphatic to an English ear (it's X that...) is in French the everyday tool for focus. A learner who avoids clefts ends up sounding flat — every sentence falls into the same prosodic shape, with no element marked as more salient than the others. Clefts are how a French speaker says "this is the important bit."

The basic structure

A cleft sentence has three parts:

1. C'est (or ce sont, in some plural cases)
2. The focused element — the constituent being highlighted
3. The relative clause — qui, que, dont, or où
   • the rest of the sentence

The choice of relative pronoun depends on the role the focused element plays in the underlying clause. This is the same logic as ordinary relative clauses: subject = qui, direct object or non-subject = que, de-complement = dont, place or time = où (though modern French often replaces où with que in clefts).

Focusing the subject: c'est X qui

When the focused element is the subject of the underlying clause, the relative pronoun is qui.

The signal: after the focused element, the verb still needs a subject, and the focused element is supplying it. C'est Marie qui a téléphoné — without Marie, qui a téléphoné has no subject; Marie fills the slot.

Focusing a direct object: c'est X que

When the focused element is the direct object — or, more generally, anything that isn't the subject of the embedded verb — the relative pronoun is que.

The signal: after the focused element, the verb already has its subject (je lis, j'ai vu, je voulais), and the focused element fills some other role. C'est ce livre que je lis — je lis is complete on its own; ce livre is the direct object that the relative clause refers to.

Focusing a place or time: c'est X que

For locations and time expressions, modern French overwhelmingly uses que in clefts, even though où would be the relative pronoun in a non-cleft relative clause. This is a small but consistent feature of French syntax: in clefts, que serves as a generic complementizer for non-subject positions.

You may encounter où in older texts or careful literary writing — c'est ici où il est mort — but in everyday French, que is the strong default. Reserve où for ordinary relative clauses (l'endroit où j'habite).

Focusing a prepositional phrase

When the focused element is the object of a preposition, the preposition stays attached to the focused element and que serves as the relative pronoun.

This is a sharp point of contrast with English. English allows preposition stranding (who I work with), but French does not — the preposition must travel with the focused element to the front of the cleft. C'est lui que je travaille avec is ungrammatical in any register.

Focusing a de-complement: c'est X dont

When the underlying verb takes the preposition de — parler de, avoir besoin de, être fier de — and you want to cleft the de-complement, the relative pronoun is dont.

The full mechanics of dont in clefts (whether to keep the redundant de in front of the focused element, register variations) are covered in the dedicated clefting-c-est-que page.

What clefting actually does: marking focus

The deep function of a cleft is to mark focus — the element of the sentence that carries new information, the answer to an explicit or implicit question.

The clearest test is to imagine the question the cleft answers:

• C'est Pierre qui l'a fait answers Qui l'a fait ? — focus is on Pierre.
• C'est ce livre que je lis answers Qu'est-ce que tu lis ? — focus is on the book.
• C'est à Paris que j'habite answers Où habites-tu ? — focus is on Paris.

In each case, the clefted element is the new information. The rest of the sentence is presupposed — taken as already shared between speaker and listener. C'est Pierre qui l'a fait presupposes that something was done; what's new is who did it.

This is why clefting is the natural response to a qui/quoi/où/quand/comment question. The question fixes the presupposition; the cleft places the new information in the focused slot.

In all these exchanges, the cleft is the natural answer because it places the new information (the answer) in the focused slot.

Clefting versus dislocation: focus versus topic

Both clefting and dislocation rearrange a sentence around one of its elements, but they do opposite work. Clefting marks focus — the new information; dislocation marks topic — the already-given subject of the discussion.

The two sentences put Pierre at the front, but the relationship between Pierre and the rest of the sentence is reversed. In the dislocation, Pierre is the launching point and the listener is being told something about Pierre. In the cleft, Pierre is the answer to a question and the rest is taken for granted.

A useful translation test: if you can paraphrase as as for X, ..., you want dislocation. If you can paraphrase as the one who/that did Y was X, you want a cleft.

Contrastive clefts

A particular use of the cleft that English has more readily available than French in everyday speech is the contrastive cleft — it's X, not Y. French uses clefting plus an explicit contrast.

The contrastive cleft is one of the strongest cases for using the construction at all: the speaker is correcting an assumption, and the focus on the corrected element is essential to the message.

Negation in clefts

Clefts can be negated. The negation typically attaches to c'est: ce n'est pas X qui..., ce n'est pas X que.... The result is a sentence that denies that X is the focused element.

The negation pattern is ce n'est pas X qui/que .... In casual speech, ne is often dropped: c'est pas moi qui ai dit ça. The structural shape is the same.

Tense and the cleft frame

The relative clause inside a cleft uses whatever tense the underlying sentence would have used. Clefting doesn't push the embedded verb into any special form.

The c'est itself can shift to past or future to match the wider temporal frame: c'était lui qui... (it was him who...), ce sera elle qui... (it'll be her who...). This is more common in writing than in speech; conversational French often leaves c'est invariant and lets the embedded verb carry the tense.

Subject-verb agreement after qui

When the focused element is a subject, the verb after qui agrees with the focused element, not with c'est. This is one of the trickiest details of cleft grammar.

English learners produce c'est moi qui est (treating c'est as the agreement controller) because English uses third-person agreement here (it's me who IS, not it's me who AM). French insists on agreement reaching across qui to land on the focused element.

Plural focus: c'est versus ce sont

When the focused element is plural, formal grammar prescribes ce sont rather than c'est. In actual usage, c'est with a plural element is overwhelmingly common, even in writing.

With first- and second-person plural pronouns, c'est is the rule even in careful writing: c'est nous qui avons gagné, not ce sont nous qui.... The ce sont form is reserved for third-person plural noun phrases in formal registers.

Common Mistakes

Mixing up qui and que

The choice between qui and que in a cleft works exactly like in an ordinary relative clause: qui if the focused element supplies the missing subject, que if the verb already has its subject.

Stranding a preposition

English learners default to leaving the preposition at the end of the sentence. French requires it to move forward with the focused element.

Failing to agree the verb after qui

This is a notorious learner trap. English uses third-person agreement here; French requires agreement with the focused element.

Using où in modern speech where que is preferred

For clefts of time and place, modern French prefers que. Save où for ordinary relative clauses.

Using subject pronouns instead of disjunctive pronouns

The position after c'est is a stressed slot, and only the disjunctive pronoun set can sit there. Subject clitics (je, tu, il) cannot exist outside their tight bond with the verb.

Key Takeaways

Clefting is one of the high-value skills of B2 French. It is the language's primary tool for marking focus — the element of the sentence that carries new information — because French prosody can't shift stress around the way English can. Learners who avoid clefting end up sounding flat; learners who master it can guide their listener's attention precisely.

The mechanics: c'est (or ce sont) + focused element + qui/que/dont/où + relative clause. Qui if the focused element is the subject of the next verb; que otherwise. Verb after qui agrees with the focused element, not with c'est. Prepositions travel with the focused element; never strand them.

The function: clefts mark focus, contrastive or otherwise. They answer the implicit who?, what?, where?, when? of a question. They are the natural response to a qui/quoi/où/quand question, and the natural way to correct an assumption. Used well, the cleft is invisible — listeners hear it as ordinary French. Used badly or avoided, it leaves your French sounding either textbook-rigid (when avoided) or oddly stressed (when focus work is attempted with stress instead).