Task 2 Choose the correct words. 1 Perhaps some light exercise could / must relieve the pain.

2 He fell asleep at his desk! He might / must have been exhausted.

3 Ann isn’t here. She must / can’t have forgotten.

4 You don’t have to / shouldn’t exercise when you don’t feel well.

5 She’s walking to school. She might / can’t have missed the bus.

6 He can’t / could have gone home. He’s left his bag on the chair.

7 We mustn’t / don’t have to learn Chinese.

8 Tania’s in Spain. You must / could have seen someone else.