Go to this page to learn about non-defining relative clauses
And to this page to see them compared, defining vs non-defining relative clauses
This powerpoint will be useful aswell
What's theory without practice? Here you have some exercises to help you.
exercise 1 choose the correct answer
exercise 2 combine the sentences using relative pronouns
exercise 3 complete the letter with a relative pronoun
exercise 4 Decide if the relative pronoun is needed or not.
Exercise 5 Add relative pronouns where needed
Exercise 6 Combine the sentences using a relative clauses, some times you will need commas
Exercise 7 Defining, non-defining
Exercise 8 Defining - non defining
