1.
1) aren’t
2) don’t
3) isn’t
4) am not
5) doesn’t
6) isn’t
7) doesn’t
8) am not
9) don’t
10) doesn’t
2.
1) Do
2) Are
3) Does
4) Is
5) Do
6) Are
3.
1) snows
2) is snowing
3) cooks
4) is cooking
5) leaves
6) is leaving
7) watch
8) are sitting, are watching
9) does
10) is doing
11) rains
12) is raining
13) has
14) is having