Defining and non defining relative clauses

This swimming pool is for people_ who can't swim very well.

• A comma is needed

• no comma is needed

Martha_ who is a very good student_ won first prize in Maths.

• commas are needed

• no commas are needed

For camp the children need clothes_which are washable.

• a comma is needed

• no comma is needed

Laura likes the necklace_ that her parents gave her.

• a comma is needed

• no comma is needed

My back_ which had hurt all day_ was still painful that evening.

• commas are needed

• no commas are needed

We took the train to Paris_ which is a city I love.

• a comma is needed.

• no comma is needed

My grandfather, _____ is 87, goes swimming every day.

• that

• which

• who

• whose

I spent my last holiday in Spain, ______ is a large country.

• that

• whose

• which

• where

My eldest son, _______ work takes him all over the world, is in Hong Kong at the moment.

• that

• which

• who

• whose

This is Peter, ___ I met at the party last week

• whose

• that

• which

• whom