Learn about using non-defining relative clauses.

Practice 1: defining or non-defining relative clauses.

Should these sentences have commas or not? Choose defining relative clause if you think it is correct and doesn't need commas (the information in bold is necessary). Choose non-defining relative clause if you want to add commas around the words in bold because they are extra information.

1. Teachers who work in primary schools should get more money.


2. Google which started in 1998 is used to find information on the internet.


3. Websites that have games aren't allowed in my college.


4. She gave me a present which was very nice of her.


5. I went to Toronto which is the capital of Canada.


6. I don't like people who tell lies.



Practice 2: Who, which, that or nothing?

Choose the best way to complete these sentences. Sometimes both answers are possible, so you should choose the last option.

  • The clothes  aren't dry yet.
  • The cat  is really cute.
  • Mr Watson, , is a spy.
  • The food  was disgusting.
  • My car, , has never broken down.
  • I hate people 
  • Tom's party, , was fantastic!!!
  • This website, , started in 2010.