6.you must see the headmaster =>You've .... 7.why isn't this TV working? =>What....... 8.when is John and Mary's wedding? =>When are.... 9.most people can understand him when he speaks English? =>He can make...... 10.we can't afford to buy this car =>The car

6. You must see the headmaster.

⇒You've to see the headmaster.

7.Why isn't this TV working ?

⇒What is the matter with this TV?

8. When is Jonh and Marry's wedding?

⇒When are John and Marry going to get married?

9. Most people can understand him when he speaks English

⇒He can make most people understand when he speaks English

10. We can't afford to buy this car

⇒The car is too expensive for us to buy.