(Exercise 14)
Restate the sentences by changing a sentence with a gerund as the subject to a sentence with it + an infinitive phrase, and vice-versa.

(Chuyển câu từ dạng có “chủ từ là động từ thêm -ing” sang dạng câu “bắt đầu bằng It và có cụm động từ nguyên mẫu có to theo sau” và ngược lại.)

1. Teasing animals is cruel.

2. It wasn't difficult to find their house.

3. Voting in every election is important.

4. It was exciting to meet the king and queen.

5. Hearing the other side of the story would be interesting.

6. It is unusual to see Joan awake early in the morning.

7. If you know how, it is easy to float in the water for a long time.

8. Mastering a second language takes time and patience.

9. Driving to Atlanta will take us ten hours.

10. It takes courage to dive into the sea from a high cliff.

(Tư liệu tham khảo: Betty Schrampfer Azar. Understanding and Using English Grammar .3rd ed.)