Learn about using defining relative clauses.

Practice: defining relative clauses with/without the relative pronoun

Look at the examples below. They are all correct, but we can sometimes remove the words who or which without changing the meaning of the sentence. 

Click 'yes' if you think who / which is necessary in this sentence.

Click 'no' if you think we don't need who / which.

Yes No  
I have a brother who is a doctor.
I live in a house which has six bedrooms.
I'm reading a book which I don't understand.
That's the dog which bit me.
I gave the money which I found to the police.
The chair which I sat on was broken.
The man who you met yesterday is very rich.
I shouted at the children who were playing in the garden.
I laughed at the joke which he told me.
I didn't understand the grammar which we studied yesterday.