The birds
leave the town if we don’t build up nesting boxes. (HAVE TO)

Ken
clean out the pond. (NOT HAVE TO)

We
collect the rubbish during the rain yesterday. (HAVE TO)

see(1форма)-saw(2 форма)-seen(3 форма)

fly(1форма)- flew(2 форма) - flown(3 форма)

go(1 форма)-went(2 форма)-gone(3 форма)

put-put-put - (у этого глагола все 3 формы одинаковые)

have(1 форма)-had(2 форма)-had(3 форма)

take(1 форма)-took(2 форма)-taken(3 форма)

say(1 форма)-said(2 форма)-said(3 форма)

give(1 форма)-gave(2 форма)-given(3 форма)

я тебе все три формы не путаться)

1. i didn't disturb her yesterday.

2. the water boils ( явление, значит - present simple)

3. the man is

4. what was he doing when you saw him yesterday?

5. i don't

6. they studied

7. i will not do it tomorrow. (или i am not going to do it tomorrow)

8. i was sleeping.

9. did you do

10. what are they talkiing about?

11. do you believe in god?

12. soon they will be back.

13. yesterday my parents were not watching tv

14. she bought a dress last friday.

15. what is your father doing now? - he is waterng the flowers.

16. where are you going to the next week-ends?

17. when we were playing in the yard yesterday it suddenly started raining heavily.

18. does he study at the evening department?

19. now i am not learning criminal law, i am learning french.

20. we will go out of town next sunday if the weather does not change.