2

1. the library is never open on Sundays.

2. does Zach often go to the park with his friends?

3. you should always clean your teeth in the morning.

4. we are not visiting our grandparents this weekend.

5. Is Tom thinking about travelling to Spain this summer?

3

1. a) have

b) is having

2. a) think

b) am thinking

3. a) am seeing

b) see

4. a) looks

b) is looking