hãy giải thích vì sao lm như thế này Hoàn thành câu sử dụng thì hiệntại hoànthành 1. We (not / work)haven't worked today. 2. I (buy)have bought a new car. 3. I (not / plan) haven't planed my holiday yet. 4. Which country (be / you)have you been ? 5. She (write) has written four letters. 6. He (not / see) hasn't seen her for a long time. 7. (be / you) Have you been at company? 8. The film (not / start) haven't started. 9. (speak / she) Has she spoken to her boss? 10. No, she (has / not)hasn't the time yet. II. Hoàn thành câu sử dụngthì HTHT 1. Loan have sent me an e-mail. (to send) 2. Linh and Ngọc have visited the museum. (to visit) 3. We have been at the pet shop. (to be) 4. He has already packed his rucksack. (to pack) 5. Tuấn has had an accident(to have) 6. I have done the shopping for my mother. (to do) 7. I have just cleaned my room. (to clean) 8. Long has painted his room. (to paint) 9. Thư and Tú have gone to a concert. (to go) 10. My boyfriend has given up smoking. (to give up) III. Bài tập tổng hợp các thì khác nhau 1. you / keep a pet for two years ⇒Have you kept a pet for 2 years? 2. you / eat Taiwan food before? ⇒Have you eaten Taiwan food before? ⇒Has it rained for a long time? 4. who / we / forget to invite? ⇒Who have we forgotten to invite? 5. we / not / hear that poem already ⇒We haven’t heard that poem already. 6. she / not / forget her books ⇒She hasn’t forgotten her books. 7. He / steal all the chocolate ⇒He’s stolen all the chocolate. 8. I / explain it well? ⇒Have I explained it well? 9. who / she / meet recently? ⇒Who has she met recently? 10. how / we / finish already? ⇒How have we finished already? 11. she / study Latin ⇒She’s studied Latin. 12. I / know her for two months ⇒I have known her for 2 months 13. where / you / study English? ⇒Where have you studied English? 14. what countries / they / visit in Asia? ⇒What countries have they visited in Asia? 15. she / hurt her leg ⇒She's hurt her left 16. He / leave his phone in a bus ⇒He’s left his phone in a bus. 17. I / not / lose my ticket ⇒I haven’t lost my ticket. 18. He / call his mother? ⇒Has he called his mother? 19. She / take a taxi? ⇒Has she taken a taxi? 20. He / go / to the library today ⇒He’s gone to the library today. IV. Bài tập nâng cao 1. Did you like the new ‘Starwar’ movie? I __________ it yet. A. did not see B. haven’t seen 2. Linh is a very close friend of mine. We __________ each other for seven years. A. have known B. know 3. Do you know what time Ánh __________ the office? A. left B. has left 4. You __________ late for work too many times this year. If you’re not careful you’ll be fired. A. were B. have been 5. I __________ quite a few emotional problems last month but this month things are getting better. A. had B. have had 6. We had an exchange student from Laos who __________ the sea so we’re taking her to a beach this weekend. A. never saw B. has never seen 7. Since I started working here I __________ more experienced at dealing with challenges. A. have become B. became 8. I can’t remember the last time I __________ to the pool. A. went B. have been