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1)
11 are studying
12 study
13 studies
14 will study
15 studied

6) 9 has just come 
10 have already gone
11 swam
12 did

7)
5 is visited
6 are played
7 is done
8 will be learned

4)
1 visit, will drink
2 comes, will play
3 rains, will stay