English Grammar Guide


Non-Defining Relative Clauses: Subject


Usage - Non-Defining Information: Subject

We can use a relative clause to give more information about the subject. We don't need a second sentence. The information isn't essential for understanding which thing it is.

  • To give more information about the subject
  • The information is not essential

Grammar - Non-Defining Relative Clauses

We use who in place of the person.

We use which in place of the thing.

We use commas.

We do not use that when the clause is non-defining.

  • SUBJECT PRONOUNRELATIVE PRONOUN
  • PERSONwho
  • THINGwhich
  • OBJECT PRONOUN RELATIVE PRONOUN
  • PERSONwho
  • THINGwhich
  • Use commas: , ... ,

Examples - Non-Defining Information: Subject

MAIN SENTENCEINFORMATION
The nurse helped me a lot.She was very kind.
This book is very useful.I liked it a lot.

Examples - Non-Defining Information: Subject

The nurse, who was kind, helped me a lot.
This book, which I love, is very useful.

Be Careful!

  • We can't use that with non-defining relative clauses.
  • The nurse, that was kind, helped me.
  • The nurse, who was kind, helped me.
  • This book, that I love, is very useful.
  • This book, which I love, is very useful.
  • We need a RELATIVE PRONOUN with non-defining relative clauses.
  • This book, I love, is very useful.
  • This book, which I love, is very useful.
Symbols & Abbreviations
Correct
Incorrect

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