III
1, could
2, turning
3, forgetting
4, was watching
IV
1, was written
2, to go
3, wearing
4, was taking
5, turned
6, to buy
7, to study
8, pouring
V
1, Do you mind tidying the classroom, please?
2, Your laptop will be repaired by my father tomorrow.
3, English is spoken all over the world.
4, It is interesting to play guitar.