Choose the sentences in which you should use a comma or commas. More than one answer is possible.

Tick the correct answers.

• Don't visit Rome in the summer () unless you book a hotel in advance.
• If you love ballet () I can buy you a ticket.
• My sister Mary () who is 20 () likes ice cream.
• I would rest () if I worked on the weekends.
• Nathan said () that he would be here the next day.