tìm lỗi sai và sửa lỗi đó 1. When he was young, he used to helping the poor. 2. We have written to each other when we were in primary school 3. Linh made cakes in the kitchen with her mother at 7p.m yesterday. 4. Peter saw an accident while he crossed the street. 5. When we came to the house last night, everyone prepared for the house warming 6. They were watching TV when the earthquake begins last night. 7. This is the first time I visited a famous place in Hanoi. 8. The power was cut while we watched the football match between Laos and Vietnam. 9. He has lived with his grandmother when he was ten. 10. We havent met him when we left for Da Nang last year 11. While I was working in the garden yesterday afternooon, my son played video games 12. Karen and his cousin had watched a comedy on TV at 8.30 p.m last night. 13. At this time last night John was talking on the phone with his friend when I come in. 14. While the man has driven home, he had an accident because of the dense fog. 15. My life had been more wonderful since you came. 16. While we walked along the river, it started to rain heavily 17. She will help us as soon as she will finish her work tomorrow. 18. When we arrive at the airport in Ha Noi yesterday afternoon, it was raining heavily. 19. I learnt a lot of Japanese while I am in Tokyo 20. Ill stay here until you will get back.