Bài tập viết lại câu thì hiện tại hoàn thành và quá khứ đơn 1. Samuel started keeping a diary in 1997. ->Samuel has 2. We started learning English five years ago. ->We have 3. I began living in Ho Chi Minh City when I was ->I have 4. She has taught the children in this remote village for five months. ->She started 5. He hasn't written to me since April. ->The last time 6. She hasn't had a swim for five years. ->She last 7. They last talked to each other two months ago. ->They haven't 8. The last time she saw her elder sister was in 1999. ->She hasn't 9. She hasn't written to me for years. ->It's years 10. It's two weeks since they cleaned their room. ->They 11. It's over six months since John had his hair cut. ->John 12. How long is it since you last rode a bicycle? ->When 13. How long is it since he last wrote to you? ->When 14. When did he last talk to you? -> how long