1 have brought
2 is swimming
3 what were you doing at 6 o'clock yesterday?
4 Have you ever seen the Pyramids?
5 went
6 go
7 had done
8 will you help your father tomorrow?
9 came,had returned,was cooking
10 was going, remembered,had forgotten
11 told,had worked
12 arrived, discovered,had broken,had disappeared, didn't know,had done
13 got,was collecting
