C1 Grammar: Master Cleft Sentences for Emphasis — C1 English grammar lesson by Langcom

C1 Grammar: Master Cleft Sentences for Emphasis

Raúl Maguiña

Fondateur de Langcom | Examinateur pour les examens de Cambridge et du SIELE

septembre 13, 2026

C1✏️ Grammaire⏱️ 6 min de lecture📅 Mise à jour en septembre 2026
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Cleft sentences are special grammatical structures used to add emphasis to a specific part of a sentence, making your communication clearer and more impactful in English. They allow you to highlight new or important information, drawing the listener’s or reader’s attention to what matters most. Instead of a simple sentence like I met John yesterday, you can use a cleft sentence to emphasize ‘John’ (It was John that I met yesterday) or ‘yesterday’ (It was yesterday that I met John). This technique is common in advanced English, helping you sound more natural and sophisticated, especially when telling stories, explaining complex ideas, or correcting misunderstandings. Mastering clefts is a key step for C1 learners aiming for fluent and expressive English, allowing you to control focus and add nuance to your expressions.

What are Cleft Sentences and Why Use Them?

Cleft sentences are grammatical constructions that divide a single clause into two parts. This division helps to emphasize one part of the sentence more than the others.

You use cleft sentences to:

  • Emphasize new information: Make a specific detail stand out.
  • Correct misunderstandings: Clearly state what is true, often in contrast to what someone else believes.
  • Add focus and clarity: Guide your listener’s or reader’s attention to the most important element.
  • Sound more natural: Native speakers often use clefts in conversation and writing, especially at C1 level.

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How Do You Form 'It' Cleft Sentences?

The 'It' cleft is one of the most common types. It uses the structure It + be + emphasized element + that/who/which + rest of sentence.

Le verbe be must agree with the tense of the original sentence. The emphasized element can be a noun, a noun phrase, or a time/place adverbial.

  • Emphasizing a person: Utilisation who ou that. It was my brother who called me. (Original: My brother called me.)
  • Emphasizing a thing: Utilisation that ou which. It was the loud music that bothered me. (Original: The loud music bothered me.)
  • Emphasizing a time: Utilisation that ou when. It was yesterday that I saw her. (Original: I saw her yesterday.)
  • Emphasizing a place: Utilisation that ou where. It was in Paris where they first met. (Original: They first met in Paris.)

When Do You Use 'What' Cleft Sentences?

'What' clefts are used to emphasize an action or a situation. The structure is What + clause + be + emphasized element.

The 'what' clause acts like a noun, referring to 'the thing that' or 'the action that'. The emphasized element usually comes after the verb be.

  • Emphasizing an action/thing: What I need is a long vacation. (Original: I need a long vacation.)
  • Emphasizing a feeling: What I love most is spending time with my family. (Original: I love spending time with my family most.)
  • Emphasizing a problem: What happened was that the car broke down. (Original: The car broke down.)

How Do 'The Thing/Person/Place/Reason' Clefts Work?

These clefts are similar to 'what' clefts but use specific nouns to introduce the emphasized information. The structure is The thing/person/place/reason + (that/who/which/why) + clause + be + emphasized element.

You choose the introductory noun based on what you want to emphasize:

  • Emphasizing a thing: The thing that surprised me was his sudden departure. (Original: His sudden departure surprised me.)
  • Emphasizing a person: The person who helped me was my neighbor. (Original: My neighbor helped me.)
  • Emphasizing a place: The place where I feel happiest is by the sea. (Original: I feel happiest by the sea.)
  • Emphasizing a reason: The reason why I left was because I was tired. (Original: I left because I was tired.)

What About 'All' Cleft Sentences?

'All' clefts are used to emphasize that something is the seulement thing or action involved. The structure is All + clause + be + emphasized element.

This type of cleft often implies a sense of limitation or exclusivity.

  • All I want is a quiet evening at home. (Meaning: I only want a quiet evening at home.)
  • All she did was smile. (Meaning: She only smiled.)
  • All we need is a little more time. (Meaning: We only need a little more time.)
Summary of Common Cleft Sentence Types
Cleft Type Structure Exemple
It-cleft It + be + emphasized element + that/who/which + clause It was Sarah who won the prize.
What-cleft What + clause + be + emphasized element What I need is a good night's sleep.
The thing/person/place/reason-cleft The thing/person/place/reason + (relative pronoun) + clause + be + emphasized element The reason why I came was to see you.
All-cleft All + clause + be + emphasized element All I want is peace and quiet.

Exemples

  • It was the new policy that caused all the confusion.
  • What I really appreciate is your honest feedback.
  • The person who inspired me most was my grandmother.
  • It wasn't until midnight that they finally arrived.
  • All he ever talks about is his new project.
  • The reason why she resigned was to pursue her dreams.

Entraînement

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Erreurs courantes chez les hispanophones

Spanish speakers sometimes make specific errors with cleft sentences:

  • Omitting the verb be: In Spanish, you might directly translate, but English requires be.
    Incorrect : What I want, a new car.
    Correct : What I want is a new car.
  • Using the wrong relative pronoun: Choosing which instead of who for people, or omitting that/ who/ which when it's needed.
    Incorrect : It was my friend which helped me.
    Correct : It was my friend who helped me.
  • Direct translation of emphasis: Spanish often uses intonation or word order for emphasis. Clefts are a specific English structure, not always a direct translation.
    Incorrect : The thing that I like it is chocolate. (Redundant 'it')
    Correct : The thing that I like is chocolate.

Questions fréquemment posées

What is the main purpose of a cleft sentence?

The main purpose is to add emphasis to a specific part of a sentence, making that information stand out. For example, in It was John who broke the vase, the focus is clearly on John.

Are cleft sentences formal or informal?

Cleft sentences are versatile. They can be used in both formal and informal contexts. They are very common in spoken English to add natural emphasis, but also appear in written English for clarity and rhetorical effect.

Can I use cleft sentences with any verb tense?

Yes, the verb be in a cleft sentence can be in any tense (present, past, future, perfect, etc.) to match the original meaning of the sentence. For example, It will be tomorrow that we leave ou It has been raining all week that has made me sad.

What is the difference between 'It was...' and 'What...' clefts?

It was... clefts usually emphasize a noun, pronoun, or adverbial (person, thing, time, place). What... clefts typically emphasize an action or a situation, often expressed as a noun phrase or a gerund phrase.

À propos de l'auteur : Raúl Maguiña

Raúl Maguiña est le directeur de l'Asociación Educativa Langcom, un centre agréé de préparation à l'examen Cambridge English situé à votre pays. Fort de plus d'une décennie d'expérience dans l'enseignement des langues et les certifications internationales, il a aidé des milliers d'étudiants, d'enseignants et d'établissements d'enseignement dans 25 pays à obtenir les certifications d'anglais Cambridge, IELTS, TOEFL et Michigan.

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