Exercise 2:

1, get

2, would come; sent

3, went; would met

4, press

5, will not let

6, had written

7, would buy; had

8, had not rained; would not be

Exercise 3:

1, A -> would

2, C -> will

3, C -> would

4, A -> knew

5, B -> hadn’t helped

6, C-> had

Giải thích: Trước hết, mình nhắc lại cấu trúc của các loại câu điều kiện:

Loại 1: if + Simple Present, will-Future

Loại 2: if + Simple Past, Conditional I (= would + Infinitive)

Loại 3: if + Past Perfect, Conditional II (= would + have + Past Participle)

1, “won” -> câu điều kiện loại 2 nên “do” -> “would”

2, “is” -> hiện tại đơn -> câu điều kiện loại 1 nên “would” -> “will”

3, chuyển “could” -> “would” vì không dùng “can” và “be able to” cùng lúc.

4, “would tell” -> loại 2 nên “know” -> “knew”

5, “couldn’t have overcome” -> loại 3  nên “didn’t help” -> hadn’t helped

6, “would buy” -> loại 2 nên “had had” -> had

Exercise 4:

1, If he weren’t busy now, he could take part in the trip to the countryside.

2, If I were you, I would recycle these plastic carrier bags.

3, If he polished his shoes, he would look smart.

4, Peter would get good marks if he prepared his lessons well.

5, If you don’t go right now, you will be late for the train.

6, If the test hadn’t been too difficult, I would have finished it on time.