Rewrite the following sentences, using the words given. 4. My sister began to study English a year ago. -> She has ..................................................................................................... 6. Scientists began to fight against AIDS in 1980. -> Scientists have .......................................................................................... 7. This hospital began to use laser treatment 5 years ago. -> This hospital has been ............................................................................. 8. She started working as a book keeper for this company 5 years ago. -> She has ..................................................................................................... 10. How long have you studied English? -> When ......................................................................................................... 11. The Browns have been living in London for 20 years. -> The Browns began .................................................................................... 16. When did she begin to do research on lung cancer? -> How long ...................................................................................................

Đỗ Thị Linh

Cách làm:

- Để chuyển từ quá khứ đến hiện tại hoặc dùng cấu trúc Present Perfect, chúng ta cần sử dụng động từ "have/has + past participle". Trường hợp này cụ thể là "have + past participle".
- Chú ý sự thay đổi trong cấu trúc câu sau khi chuyển từ quá khứ sang hiện tại trong trường hợp này.

Câu trả lời:

4. She has been studying English for a year.
6. Scientists have been fighting against AIDS since 1980.
7. This hospital has been using laser treatment for 5 years.
8. She has been working as a book keeper for this company for 5 years.
10. When did you start studying English?
11. The Browns began living in London 20 years ago.
16. How long has she been doing research on lung cancer?

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