6. The last time my sister drove a car was 6 years ago.
7. How long have you drunk coffee?
8. It is the first time I have drawn pictures.
9. If you are careful, you won't fall down.
10. Uniform will be worn at school.
Practice 5
1 d, 2a, 3 d, 4d, 5a, 6a, 7b, 8c, 9b, 10b
Practice 6
1. for -> since
2. not to spending -> not to spend
3. will -> would
4. would -> will
5. two-days-> two-day
6. to -> from
7. had -> was having
8. knew -> knows
9. not play -> not to play
10. following day -> the following day
Practice 5
1. would go
2. were
3. has
4. arrives
5. tries
6. wants