I. 1) will, be
2) are
3) was
4) did, was
5) is
6) was, was
7) will be
8) am, am
9) is
10) did, was
II. 1) She will not be at home tomorrow.
2) My friend is ill
3) I was a student in last year.
III. 1) It not often snows in winter, Is it often snows in winter?
2) We didn`t spend our holidays in the country last summer, Did we spend our holidays in the country last summer?
3) She will not study in London, Will she study in London?
IV. 1) worked
2) will go
3) did not watch
4) wrote
5) bought
6) did not buy
7) go
8) will go
9) cooked
10) wash