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表示 (主語(yǔ) )客觀 因素的義務(wù)或必要時(shí)用have to。 — No, I needn’t. /No, I don’t have to. 不,不是的。 You must go to bed now. 你現(xiàn)在必須睡覺(jué)了。 含有 all, both, everybody, always, everywhere等含有“總括意義”的詞的否定句是部分否定,而不是全部否定。 Last time I saw him he was yet a poor man. 上次我見(jiàn)到他時(shí),他還是個(gè)窮人。 2. Compared with poems, stories usually have longer passages. 和詩(shī)比起來(lái),故事通常有較長(zhǎng)的章節(jié)。 4. …it can take a long time to e up with the right words. 需要花費(fèi)很長(zhǎng)時(shí)間才能想出恰當(dāng)?shù)脑~語(yǔ)。 We mustn’t be late again. 我們不應(yīng)該再遲到了。 She is not at home. She must be out. 她不在家里,她一定外出了。 誤: He will must go there tomorrow. 正: He will have to go there tomorrow. 正: He must go there tomorrow. 他明天必須去那里。 1. —Where is Mary? — She ____ in the library. A. should be B. must be C. can be D. must have been 2. His room is dark. He must ____ to bed. A. go B. be going C. have gone D. have been gone 3. —“I think Helen is at home.” —“ No, she ____ be at home, for she phoned me from the airport just five minutes ago.” A. mustn’t B. needn’t C. can’t D. daren’t 4. He’s late. What ____ have happened to him? A. can B. may C. should D. must 5. “Must he do it?” “No, he ____.” A. mustn’t B. needn’t C. doesn’t have to D. B or C 6. You must be a writer, ____ you? A. mustn’t B. are C. must D. aren’t 7. We ____ hurry if we want to arrive in time. A. must B. need C. may D. have to Preview the words and expressions in Lesson 20. My Favourite Food: Write a 4line rhyming poem about your favourite food. Include a drawing of the food in the poem in a creative way.