Emphatic structures (c'est... qui / que)

Marie a téléphoné. → C'est Marie qui a téléphoné. (It's Marie who called.)

Both sentences say the same thing, but the second one puts a spotlight on Marie — as if answering the question "who called?". This is called a cleft sentence: splitting one plain sentence into two pieces, c'est... qui/que, to single out exactly the part you want to emphasize.

Quick shortcut: pull out the element you want to stress, wrap it in c'est... qui (if it's the subject) or c'est... que (for everything else), and leave the rest of the sentence as it was.

This is a different thing from the everyday habit of repeating a subject as a pronoun to introduce a topic, as in Marie, elle est là — that's a neutral, mostly spoken way of naming what you're about to talk about. C'est... qui/que actively singles one element out as the answer to an implicit question, and it works in writing just as well as in speech.

Emphasizing the subject: c'est... qui

When the element you want to stress is the subject of the sentence, wrap it in c'est... qui:

• C'est Marie qui a téléphoné. (It's Marie who called — not someone else.)
• C'est le voisin qui a trouvé les clés. (It's the neighbour who found the keys.)
• C'est nous qui avons organisé la fête. (It's us who organized the party.)

The verb after qui still agrees with the emphasized subject, not with c'est — c'est nous qui avons organisé, not ❌ c'est nous qui a organisé.

Emphasizing everything else: c'est... que

For any other element — a direct object, a time expression, a place, a reason — use c'est... que instead:

• C'est Paul que j'ai vu. (It's Paul that I saw — Paul is the object here, not the subject.)
• C'est demain que je pars. (It's tomorrow that I'm leaving.)
• C'est pour ça qu'elle est fâchée. (That's why she's angry.)

The choice between qui and que depends entirely on the emphasized element's role in the rest of the sentence — ✅ c'est Paul qui a téléphoné (Paul is the subject of téléphoner), but ✅ c'est Paul que j'ai vu (Paul is the object of voir), never ❌ c'est Paul qui j'ai vu.

Keeping the preposition: c'est à/de/avec... que

If the verb governs the emphasized noun with a preposition, that preposition has to stay right where it was — it doesn't disappear just because the noun moved to the front:

• ✅ C'est à Paul que j'ai parlé. (It's to Paul that I spoke.) — never ❌ c'est Paul que j'ai parlé, since parler à quelqu'un.
• ✅ C'est de ce livre qu'elle parle. (It's this book she's talking about.) — parler de quelque chose.
• ✅ C'est avec elle que je travaille. (It's with her that I work.) — travailler avec quelqu'un.

Whatever preposition the verb would normally need stays attached to the emphasized element, right after c'est.

Emphasizing a whole idea: ce qui/ce que/ce dont... c'est

To emphasize not just one word but an entire idea — "what I want", "what matters" — French flips the order and uses a relative pronoun to open the sentence, ending with c'est and the emphasized part:

• Ce qui compte, c'est la santé. (What counts is health.) — qui, because ce (standing in for "the thing that matters") is the subject of compter.
• Ce que je préfère, c'est le chocolat. (What I prefer is chocolate.) — que, because ce (standing in for "the thing I prefer") is the object of préférer.
• Ce dont j'ai besoin, c'est de temps. (What I need is time.) — dont, because ce is governed by avoir besoin de quelque chose.

Ce itself is the placeholder — it plays the subject/object/de-object role inside the opening clause, and c'est + the element after it says exactly what ce refers to. The same qui/que/dont choice that governs ordinary relative clauses governs which one opens this pattern.

Talking about the past: c'était... qui/que

The emphasized event can be in the past while c'est itself stays exactly as it is — C'est hier qu'on s'est rencontrés (It was yesterday that we met) identifies, right now, when the meeting happened. C'est only shifts to c'était when the act of identifying is itself set in a past frame — telling a story, or recalling what was true at some past moment:

• À ce moment-là, c'était Marie qui avait téléphoné. (At that moment, it was Marie who had called.)
• Personne ne le savait encore, mais c'était elle qui avait raison. (No one knew it yet, but she was the one who was right.)

Common mistakes

• ❌ C'est Paul qui j'ai vu. → ✅ C'est Paul que j'ai vu. (Paul is the object of voir here, not the subject — que, not qui)
• ❌ C'est Paul que j'ai téléphoné. → ✅ C'est à Paul que j'ai téléphoné. (téléphoner à quelqu'un — the preposition can't be dropped just because Paul moved to the front)
• ❌ C'est nous qui a organisé la fête. → ✅ C'est nous qui avons organisé la fête. (the verb after qui agrees with the emphasized subject, not with c'est)

Quick check

Key takeaways

• A cleft sentence pulls one element out for emphasis: c'est... qui if it's the subject, c'est... que for everything else — a direct object, a time, a place, a reason.
• A verb's governed preposition stays put: c'est à Paul que j'ai parlé, never c'est Paul que j'ai parlé, when the verb needs à, de, or another preposition.
• Ce qui/ce que/ce dont... c'est does the same job for a whole idea rather than a single word, using the same qui/que/dont choice as ordinary relative clauses.
• C'est stays put even for a past event (c'est hier qu'on s'est rencontrés); it shifts to c'était only when the identification itself is anchored in a past frame, like telling a story.
• This is a different tool from repeating a subject as a pronoun to introduce a topic (Marie, elle est là) — that's a neutral way of naming a topic; c'est... qui/que actively spotlights one element as the answer to an implicit question.