1 has already written
2 has just eaten
3 the boys found an old cage in their garden yesterday
4 they hasn't discussed the problem yet
5 Charles has just finished
6 went
7 has been
8 has just written
9 came , had, began
10 did your relatives take part
11 have your parents told...
12 went, bought
13 have already made
14 have just set
15 hasn't taken
16 what plants have you watered...
17 did i visited....