III, Viết lại câu với nghĩa đã cho : 

This is the first time + S + have/has + P2: Lần đầu làm gì

=> S +have/has + never + P2 + before

=> S+ have/has not + P2 + before

1. I've never heard about this technology before 

3. Since the computer was invented, people have saved a lot of time

4. We have used the new software for 3 months

5. They have never released a more stable version before

6. It is the first time i have kown about this science forum

7. She hasn't bought a smart phone for 2 years

8. This is the first time we've introduced an electric vehicle

9. I haven't seen my classmate since I left school

10. This is the first time Mai has been to France

IV. Hoàn thành câu với động từ trong ngoặc :

1. cooking : nấu

2. installing ; nhận

3. discovering : tìm kiếm

4. pumping : thải ra

5. transmitting : truyền 

6. determining :định hướng

7. replacing : thay thế

8. growing crops : trồng vụ

9. making : làm

10. taking : viết

V. Hoàn thành câu dùng dang ''toV'' :

1. to play 

2. to advertise : quảng bá

3. to store : lưu trữ

4. to go

5. to eat

6. to measure : đánh giá

7. to illustrate : minh họa

8. to evacuate : sơ tán

9. to lubricate: bôi trơn

10. to generate : tạo ra