Giúp mình ba câu này với cần gấp lắm r, cảm ơn

1. You (receive) any letters from your parents yet? 2. How long Bob and Mary (be) married? 3. My father (not smoke) for 5 years. 4. Birds (build) their nests in the summer and (fly) to the south in winter. 5. I'm busy at the moment. I (redecorate). the sitting room. 6. I always (buy) lottery tickets but I never (win) anything. 7. I (work) for him for 10 years and he never once (say) "good morning" to me. 8. Mr Jone (be) principal of our school since last year. 9. Violets (bloom) in Spring. 10. We (not live) in England for 2 years now. 11. They (prepare) the Christmas dinner at the moment. 12. George (work) at the university so far. 13. Listen! They (learn) a new song. 14. David (repair) the TV set at the moment. He (work) at it for one hour. 15. I can't go with you because I (not finish) my homework yet. 16. John (wash) his hands now. He just (repair) the bike. 17. I (work) at my report since Monday. Now I (write) the conclusion. 18. The earth (circle) the sun once every 365 days. 19. How many times you (see) him since he went to Edinburgh? 20. Look! The boy (cry) 21. Mary (lose) her hat for 2 days. 22. He (not finish) doing it yet. 23. She (not see) him since Christmas

Calli: Lag NL: Sao dạo này hodap Lag thế

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Cho bốn lực đồng quy: F1= 9N, F2=4N, F3=9N, F4=2N. Tìm độ lớn hợp lực

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