1) were playing
2)was skipping
3)have called
4) had set
5) has already read
6) has told
7)was building
8)had lived
9)was working
10)was having
11)have just talked
12)had finished
13)had visited
14)have had
15)have seen
16)was cleaning
17)have swum
18)had worked
19)He has never been to...
20)They have already written the...