Mastering Reduced Relative Clauses: A C1 English Grammar Guide — C1 English grammar lesson by Langcom

Mastering Reduced Relative Clauses: A C1 English Grammar Guide

Рауль Магинья

Основатель Langcom | Экзаменатор по экзаменам Cambridge и SIELE

Сентябрь 6, 2026

C1✏️ Грамматика⏱️ Время чтения: 6 мин📅 Updated Сентябрь 2026
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Reduced relative clauses make your English more concise and sophisticated by shortening relative clauses. They are a common feature of advanced English, especially in formal writing and academic speech. This grammatical structure allows you to condense information, making your communication more efficient and impactful. You can reduce a relative clause when the relative pronoun (like who, which, или that) acts as the subject of the clause and the verb is a form of be. By removing both the relative pronoun and the be verb, you create a more streamlined sentence structure. For example, instead of saying The student who is sitting in the front row is very bright, you can simply say The student sitting in the front row is very bright. Mastering this technique not only improves the flow of your sentences but also demonstrates a higher level of English proficiency, crucial for C1 learners aiming for natural and advanced expression.

What Are Reduced Relative Clauses in English?

Reduced relative clauses are a way to make your sentences shorter and more elegant. They take a full relative clause and remove some words, but the meaning stays the same.

This advanced grammar point is very common in English, especially in written texts and formal spoken language. Using them shows a higher level of fluency and precision.

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When Can You Reduce a Relative Clause?

You can reduce a relative clause only under specific conditions. It's important to understand these rules to avoid mistakes.

  • The relative pronoun must be the subject of the relative clause. This means the pronoun (like who, which, или that) is performing the action of the verb.
  • The verb in the relative clause must be a form of to be (например, is, are, was, were).

If these two conditions are met, you can remove both the relative pronoun and the form of to be.

How Do You Form Reduced Relative Clauses?

There are four main ways to form reduced relative clauses, depending on the structure of the original clause:

  • With a Present Participle (-ing): Use this when the original clause has an active verb.
    • Original: The woman who is speaking on the stage is a famous scientist.
    • Reduced: The woman speaking on the stage is a famous scientist.
  • With a Past Participle (-ed or irregular): Use this when the original clause has a passive verb.
    • Original: The car that was damaged in the accident is being repaired.
    • Reduced: The car damaged in the accident is being repaired.
  • With an Adjective: Use this when the original clause describes the noun with an adjective.
    • Original: The students who are eager to learn always succeed.
    • Reduced: The students eager to learn always succeed.
  • With a Prepositional Phrase: Use this when the original clause uses a preposition to locate or describe the noun.
    • Original: The book which is on the table belongs to me.
    • Reduced: The book on the table belongs to me.

Defining vs. Non-Defining Reduced Relative Clauses

Reduced relative clauses can come from both defining and non-defining relative clauses. The rules for reduction are the same, but the punctuation differs.

  • Defining Reduced Clauses: These provide essential information about the noun. They do not use commas.
    • Пример: The person calling me yesterday was my old friend. (Original: The person who was calling me yesterday...)
  • Non-Defining Reduced Clauses: These provide extra, non-essential information. They are separated by commas.
    • Пример: My brother, working as a doctor, lives in London. (Original: My brother, who is working as a doctor, lives in London.)
    • Пример: Wildfires, common during the summer season, can happen anytime. (Original: Wildfires, which are common during the summer season, can happen anytime.)

Using non-defining reduced clauses is a mark of very advanced English and adds a sophisticated flow to your writing.

Summary of Reduced Relative Clause Forms
Original Clause Type Reduced Form
who/which/that + is/are/was/were + -ing (active) -ing participle
who/which/that + is/are/was/were + past participle (passive) past participle
who/which/that + is/are/was/were + adjective adjective
who/which/that + is/are/was/were + prepositional phrase prepositional phrase

Примеры

  • The documents requiring a signature are on your desk.
  • Anyone interested in the workshop should register online.
  • The new policy, introduced last month, has been widely discussed.
  • The only solution available to us is to postpone the meeting.
  • The city, known for its historical sites, attracts many tourists.

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Распространенные ошибки у носителей испанского языка

Spanish speakers sometimes make mistakes with reduced relative clauses because the structure is quite different from Spanish. Here are common errors:

  • Reducing when to be is not present: You cannot reduce a clause if the verb is not a form of to be.
    • Неправильно: The man lives next door is very friendly.
    • Правильно: The man who lives next door is very friendly. (Cannot reduce because lives is not is living).
  • Reducing when the relative pronoun is the object: If the relative pronoun is the object of the clause, you cannot reduce it in this way.
    • Неправильно: The book I read was interesting. (This is a different type of reduction, not involving to be).
    • Правильно: The book that I read was interesting. (Here, that is the object, not the subject).
  • Incorrect participle form: Using the wrong participle (e.g., -ing вместо -ed for passive voice).
    • Неправильно: The language speaking in Brazil is Portuguese.
    • Правильно: The language spoken in Brazil is Portuguese. (Because the language is spoken, а не speaking).

Часто задаваемые вопросы

What is the main benefit of using reduced relative clauses?

The main benefit is to make your sentences more concise and efficient. They help you convey information more directly, which is a sign of advanced English. For example, The report which was published yesterday становится The report published yesterday.

Can I always reduce a relative clause?

No, you can only reduce a relative clause if the relative pronoun is the subject of the clause AND the verb is a form of to be. If these conditions are not met, you cannot reduce it in this way.

Do reduced relative clauses change the meaning of the sentence?

No, they do not change the core meaning. They simply present the same information in a more condensed form. The sentence The students who are studying hard will pass the exam means exactly the same as The students studying hard will pass the exam.

Are reduced relative clauses more common in speaking or writing?

They are more common in formal writing, academic texts, and news reports, where conciseness and precision are valued. While they appear in speech, they are generally less frequent than in written English.

Связанные уроки

Об авторе: Рауль Магинья

Рауль Магинья является директором образовательной ассоциации «Langcom» — официального центра подготовки к экзамену Cambridge English в ваша страна. Имея более чем десятилетний опыт работы в сфере языкового образования и международной сертификации, он помог тысячам студентов, преподавателей и образовательных учреждений в 25 странах получить сертификаты по английскому языку: Cambridge, IELTS, TOEFL и Michigan.

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