Trợ lý học tập AI - Câu trả lời này chỉ mang tính tham khảo
1. Tom has been playing the piano for 4 years.
2. I have been cooking for the party for 4 hours.
3. She has been working as a secretary for 2 years.
4. My sister has been studying English for a year.
5. Scientists have been fighting against AIDS since 1980.
6. The Browns began to live in London 20 years ago.
7. John started working for this electronics firm in 1999.
8. Jack and Jill started learning how to drive 2 weeks ago.
9. When did you start studying English?
10. How long have you been doing research on lung cancer?
1. My father hasn't driven a car before. This is the first time my father has driven a car.
2. I've never met such a famous singer before. It's the first time I have met such a famous singer.
3. She has never been to the ballet before. It's the first time she has been to the ballet.
4. She hasn't drunk Coca Cola before. This is the first time she has drunk Coca Cola.
5. It's the first time I have read this book. I have never read this book before.
6. It's the first time I have ever met such an intelligent student. I have never met such an intelligent student before.
7. This is the first time my grandfather has visited Ha Long Bay. He has never visited Ha Long Bay before.
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