Question

Answer 1

have just seen

has bought

has made

has already had

have not bought

has already gone

have helped

hasn't rained

has begun

has introduced

have not gone

Answer 2

15. have just seen
16. has bought
17. has made
18. already has
19. haven't bought
20. has already gone
21. have helped
22. hasn't rained
23. has begun
24. have introduced
25. haven't gone

Answer 3

15. have just seen
16. has bought
17. has made
18. already has
19. haven't bought
20. has already gone
21. have helped
22. hasn't rained
23. has begun
19. have introduced
20. haven't gone