Một con ngựa kéo một cái xe với một lực không đổi bằng 80N và đi được với vận tốc 36km/h trong thời gian 30 phút. Tính công của con ngựa?

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Bài 5. Viết lại câu với “” if/unless” sao cho nghĩa của câu không thay đổi. 1. I can’t finish this task you don’t give me a hand. -> _____________________________________________________________________________ 2. You will run out of money if you don’t stop wasting it. -> _____________________________________________________________________________ 3. Don’t call me unless it is an emergency. -> _____________________________________________________________________________ 4. James will not pass the test unless he studies harder. -> _____________________________________________________________________________ 5. If Jane finishes her work before 6 pm, she will dine out with her friends. -> _____________________________________________________________________________ 6. My brother won’t go travelling this summer if he doesn’t find a companion. -> _____________________________________________________________________________ 7. It is not easy to do these exercises unless you listen attentively to the teacher. -> _____________________________________________________________________________ 8. If Jim doesn’t submit his essay before Tuesday, he will be punished by the teacher. -> _____________________________________________________________________________ Bài 6. Khoanh tròn vảo phương án đúng. 1. I (would buy/ bought) a new house if I had enough money. 2. If he (would try/ tried) his best, he might be successful. 3. If I (lived/ would live) in Japan, I could speak Japanese well. 4. If someone gave you a dress, which color (would you want/ you would want) it to be? 5. I would repaired the roof myself if I (would have/ had) a longer ladder. 6. You would be more comfortable now if you (didn’t/ wouldn’t) wear high heels. 7. I (wouldn’t/didn’t) buy things on the Internet if I were you. 8. If you (met/ would meet) your favorite author Mark Twain, what wouldn’t you ask him? 9. His parents would be very proud if he (wouldn’t be/ weren’t) so naughty. 10. If Jane had more money, she (would treat/ treated) herself to a decent meal. 11. If you were a billionaire, what (would you do/ did you do)/ 12. If Kate owned a computer, she (would spend/ spent) most of her free time on it. 13. If I (would know/ knew) his address, I would give it to you. 14. She would look much better if her hair (didn’t look/ wouldn’t look) so unkempt. 15. If I were in your situation, I (would/ will) let the nature take its course. Bài 7. Hoàn thành các câu sau, sử dụng dạng đúng của động từ trong ngoặc. 1. More tourists would come to our country if we (provide) ______________ better services. 2. If I studies abroad, _____________ (we/keep) in touch with each other? 3. If someone (give) ______________ you a camera, what would you do with it? 4. If I (win) _________________ a big prize in a lottery, I (donate) _______________ apart of it and (spend) _______________ the rest for myself. 5. What ___________ (you/do) if you found a wallet in the street? 6. I could watch foreign TV program without subtitles if I (know) _________ English. 7. He might be obese if he (not stop) __________________ taking in fat and sugar. 8. If he knew that it was dangerous, he (not do) _______________ it. 9. If you (see) ________________ someone drowning, ________________ (you/save) him? 10. She (be) __________________ happier if her parents (not get) ________________ divorced. 11. If you (sleep) _____________ under a mosquito net you (not be) _______________ bitten so often. 12. I (get) _________________ a job easily if I (have) ______________________ a degree. 13. If whe (have) _________ another hair style, she (look) ___________ younger. 14. if the weather (not be) _______________________ severe, out crops (grow) _______________ faster. 15. I (keep) _____________ a horse if I could afford it.