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cho hàm số y=f(x) có đạo hàm f'(x) = x^2 + 1 ∀x∈R xét chiều biến thiên
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V. Put the verb into the more suitable form, present progressive or present simple. 1.I ……………………(go) to the movies tonight. The film……………………(begin) at 7.30. 2.The world……………(change) rapidly. Things…………………(never/ stay) the same. 3.We …………………………(have) a party next Saturday. Would you like to come? 4.It…………….. (often/ rain) in summer, but it………………..(not/rain) now. 5.What time …………….this train……………..(get) to London? 6.Computers …………………….(become) more important in our lives. 7.A: (you/be)………………………………. free at lunchtime tomorrow? B: No, I………………………….(have) lunch with my parents. 8.Sue…………………..(come) to see us tomorrow. She………………. (travel)by train and her train…………(arrive) at 10.15. I …………..(meet) her at the station. 9.A: What (your sister /do)……………………………………………..? B: She is an architect but she ……………………………….(not work) at the moment. 10. Can we stop walking soon? I ………………………. (get) tired.

Ex3: Put the verbs in the present perfect tense. 1. My sister (be).................................a teacher for ten years. 2. I (not see)..............................Linh since my birthday. 3. We (wait)....................................for a year. 4. They (build)..............................that house since last years. 5. Lan (know).....................................him since she was a child. 6. You (take)...............................the medicine yet ? 7. How long you (live)..................................here ? 8. He (not send)................................any letters to me since 2003. 9. Mrs. Dung (already / make)................................a new shirt for her son. 10. My mother (just /buy).................................me a new bicycle. 11. He (practice).................................the piano since 8 o'clock. 12. I (not meet) him.....................................this movie since last week 13. Jorge (read).................................the newspaper for an hour. 14. ...............Maria (learn)...........................English since grade 6 ? 15. He (swim)..............................for half an hour. 16. How long Mr. Johnson (work)................................here ? For 35 years. 17. We (begin)...............................to study for the test since this morning. Mấy bn giúp tui với tui đang cần rất gấp cảm ơn mn nhìu ạ

IV. Use the present simple, the present progressive, be going to or will with the verb in brackets. 1.We (go) ……………….to the theater tonight. We’ve got tickets. 2.Mum I promise I (keep) ……………………my room clean. 3.We (tidy) ………………………….. our house next Sunday. 4.I’m sure Matthew (feel)………………….better tomorrow. 5.What…………… you (do)…………………tomorrow evening? –Nothing. I’m free. 6.Do you think Sarah (pass)…………………. The exam? 6 7.Sally (leave)………………………her job. She told me last week. 8.Look at that rain. I (lend)……………………. You my umbrella. 9.There’s a good film on TV tonight. I (watch)……………………… it. 10.It’s her birthday. She (have)………………………… meal with her friends tonight. 11.I think it (rain) ……………………... Look at those black clouds. 12.Would you like tea or coffee? – I (have)…………………coffee, please. 13.They (buy) ………………………..Alex a computer game for his birthday. 14.Probably Ann (drive)…………………..to the party by herself. 15.These shoes are very well-made. They (last) ………………a long time. 16.The train (arrive) ………………….. in London at 8.15 in the morning. 17.We (fly) …………………to New York at the beginning of September. 18. Her grandmother (be)…………………….ninety next week. 19. The summer term ………………(start) on April 10th. 20. Look out ! We ……………………..(crash)!

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