Bài tập viết lại câu thì hiện tại hoàn thành và quá khứ đơn 11. I haven't taken a bath since Monday. => It is ......................................................................................................... 12. Samuel started keeping a diary in 1997. Samuel has ______________________________________________ 13. We started leaming English fìve years ago. We have ______________________________________________ 14. I began living in Ho Chi Minh City when I was 8. I have ______________________________________________ 15. She has taught the children in this remote village for five months. She started ______________________________________________ 16. He has written to me since April. The last time ______________________________________________ 17. She hasn’t had a swim for five years. She last ______________________________________________ 18. They last talked to each other two months ago. They haven’t ______________________________________________ 19. The last time she saw her elder sister was in 1999. She hasn’t __________________________