Exercise 2:
1, was caught
2, is read
3, was cut
4, was being cleaned
5, is going to be built
6, has been already typed
7, ought to be typed
8, was being taught
9, are caused
10, is being repaired
Exercise 3
1, was invented
2, worked
3, was introduced
4, became
5, was
6, was used
I
1, since
2, for; since
3, for
4, since
5, for
6, for
7, since
8, since
9, for; since
10, for; since
III
1, have had
2, have lived
3, went
4, stayed
5, haven’t seen; hasn’t visited
6, has been
7, have worked
8, have moved; have been
9, have already gone
10, wore
11, have moved; got
12, have played
13, have not seen; met
14, Has Bill arrived; arrived
15, studied
IV
1, We haven’t heard from Sarah since she moved to Atlanta.
2, Sandra has worked for that company for three years.
3, My father hasn’t seen my uncle for nearly twenty years.
4, Juliette started teaching in this school in 2009.
5, Christopher wanted to buy that TV yesterday.
6, Mathew traveled to Germany 3 weeks ago.
7, Minh enjoyed the school play last Saturday.
