giúp em với ạ giải thích dùm em ạ 1. It rained yesterday after it (be) dry for months 2. We (not/ be) on time last week. 3. Alice (see) her mother in London most weekends 4. The house was very quiet when I (get) home. Everyone (go) to bed. 5. We (not/ begin) to study for the test yet 6. Where is your mother? - She (wash) my clothes in the bathroom. 7. He (leave) home two weeks ago and we (not/ hear) from him since then 8. Yesterday, we (have) lunch when we heard the news. 9. When we (see) Mr. Taylor tomorrow, I (remind) him of that. 10. He (not write) to me since he (leave) university 11. I (not, hear) the thunder during the storm last night because I (sleep) then 12. I wish Mom (be) here with us now. 13. Do you know that man who (smoke) there? 14. By the time I got to the party, most people (go) home. 15. This is the first time I (come) to Hanoi. It’s all new to me 16. Listen! Someone (walk) up the stairs. 17. I remember (play) with dolls when a child 18. She says Titanic is the best film she (see) 19. He was the first boy (finish) the exam 20. You (finish) the book I (lend) you last week?