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B2 · Pre-advanced15 min

Defining & non-defining relative clauses

Syllabus topic 21: Defining & non-defining relative clauses

Defining & non-defining relative clauses. Defining relatives restrict reference; non-defining relatives add parenthetical information with commas.

How it works

Defining relatives restrict reference; non-defining relatives add parenthetical information with commas. That is excluded from non-defining clauses and after a fronted preposition. Whom is formal for a person as object; which can refer to an entire previous clause.

Examples in context

Notice how each form fits its sentence. Read the context before choosing a form.

  • The colleague to whom I spoke was helpful.
  • He missed the train, which annoyed him.
  • My aunt, who lives abroad, is visiting.
  • The house whose roof collapsed is empty.
  • The person that you met is my tutor.

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The colleague to ___ I spoke was helpful.

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