I

1 needs - will give

2 won't win - don't know

3 wash - will cook

4 isn't - will play

5 waters - will die

II

1 had - would learn

2 would go - went

3 were - would buy

4 were

5 would be - reduced

III

1 If you keep silent, you'll not wake the baby up.

2 If Peter didn't eat so many chips, he wouldn't be fat.

3 Unless she hurries, she'll be late.

4 If he had to study for his exam, he couldn't go out.

5 If she wasn't lazy, she could pass the exam.

Ex 1 :

1 . needs/will give

2 . won't win/don't know

3 . wash/will cook

4 . isn't /will play

5 . waters/will die

Ex 2 : 

1 . had/would learn

2 . would go/were

3 . were/would buy

4 . were

5 .  would be / reduced

Ex 8 :

1 . If you don't keep silent , you will wake the baby up

2 . If Peter didn't eat so many chips , Peter wouldn't be fat

3 . Unless she hurries , she will be late

4 . If he didn't have to study for his exam , he could go out

5 . If she weren't lazy , she could pass the exam