Ответ:
Task 1.
PAST SIMPLE: three weeks ago, last night, in 2009, yesterday, last summer, for tweenty minutes, at 9 o'clock, in September.
PRESENT PERFECT: recently, just, so far, since April, already, lately, from to July, yet.
Task 2.
1. haven't painted
2. spent
3. have already seen
4. made
5. hasn't rained
6. have ever eaten
7. visited
8. got up
9. Have you been
10. has just came back
Task 3.
PAST SIMPLE: knew, began, drove, hurt, forgave, fought, rose, swept, cut, threw, left, paid, undid, grew, wore, met, told, saw, lost, wrote.
PAST PARTICIPLE: known, begun, driven, hurt, forgiven, fought, risen, swept, cut, thrown, left, paid, undone, grown, worn, met, told, seen, lost, written.