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1、表达的含义不同：【注意: must有好几种释义，这里只谈“必须”的释义】 must 一定要（做），必须要. 侧重于说话人的想法、思想，强调是说话人自己的意愿或决心，并非强迫。 have to 不得不，必须 侧重于客观上的必要，强调外部条件作用的结果， 表示“因外在原因而不得不做”，有一种不得不的意思，带着不情愿的色彩。,must(必须)和have to(必须)的区别,你现在就必须去做。 You must do it now. 你必须去睡一觉。 You must get some sleep. 我们必须互相帮助。 We must help each other. 亲爱的，我现在得走了。 Darl
2、ing, I have to go now. 你不得不照你父母的话办。 You have to do what your parents tell you. 因为没有公共汽车，我不得不步行回家。 I had to walk home because there was no bus then.,3. 否定含义不同 在否定句中, have to表示不需要，must则表示不允许。 You dont have to go there. You mustnt go there.,2. 适用时态不同 must 只能用于一般现在时和一般过去时，（在间接引语中） have to 可用于更多的场合。 She
3、said she must do well in her English.,must(必须)和have to(必须)的区别,Exercises,Dont be late again. You _ be here on time. A. may B. can C. must D. neednt You _ do it even if you dont want to. A. cant B. mustnt C. neednt D. have to 3. Must I take a bus? No, you _. You can walk from here. A. mustnt B. dont C. dont have to D. had better not to 4. It is rather cold here. Shall we light a fire? No, we _, because things here are easy to catch fire. A. wont B. cant C. mustnt D. neednt,
