4 Fill in: have to, don't have to. 1 I have to do it tonight. It's urgent! 2 You do water the plants. I've done it. 3 Do you have to leave so early? 4 He go to school. He's ill. 5 You have pay £10 to become a member.

Explanation

This exercise requires filling in the blanks with 'have to' or 'don't have to' to express obligation or lack of obligation.

Answer

• 1. I have to do it tonight. It's urgent!
• 2. You don't have to water the plants. I've done it.
• 3. Do you have to leave so early?
• 4. He has to go to school. He's ill.
• 5. You have to pay £10 to become a member.