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Exercise 3/
1. is
2. don’t go
3. will start
4. are
5. doesn’t arrive
6. is
7. accepts
8. falls
9. comes
10. washes
11. doesn’t start
12. will you repay
13. won’t be able
14. won’t be
15. will steal
16. sells
17. won’t let
18. don’t go
19. eats
20. will happen

Exercise 4/
1. Should you call him immediately, he will come.
2. Should it rain, we won't go cycling to the museum.
3. Should he get sick, he will see the doctor.
4. Should you not come, I will be very sad.
5. Should she earn a lot of money, she will fly to New York.

Exercise 5/
1. send/will come
2. will not understand/whisper.
3. will not survive/do not take
4. press/will save
5. will cross/fly
6. will answer/has
7. wears/will not stay
8. touch/ will not scream.
9. will forget/do not phone
10. will remember/give

Exercise 6/
1. Should she come, tell her to wait for me.
2. Unless I come here early, I will miss the bus.
3. Unless he does that, he will get bonus.
4. Unless she waters these trees, they will die

Bài 3:

1 is

2 don't go

3 will start

4 are

5 doesn't arrive

6 is

7 accepts

8 falls

9 comes

10 washes

11 doesn't start

12 will repay

13 won't be able

14 won't be

15 will steal

16 sells

17 won't let 

18 don't go

19 eats

20 will happen

Bài 5:

1 send/will come

2 won't understand/whisper

3 won't survive/don't take

4 press/will save

5 will cross/fly

6 will answer/haves

7 wears/won't stay

8 touch/won't scream

9 will forget/don't phone

10 will remamber/give

Bài 6: 

1 should she come, tell her......

2 unless i come......., i will........

3 unless he do that...., he will....