摘要:have to比较强调客观需要.must着重说明主观看法.另外have to能用于更多时态.比较下面的句子: We had to be there at ten.我们得在十点钟到那里. We'll have to reconsider the whole thing.这一切我将不得不重新加以考虑. 有时两者都可以用.意思差别不大. 例如: We must have to leave now.我们得走了. must在表示说话人对事物的推测时候要注意它比may肯定得多.相当于汉语的“一定 或“准是 .(只有在肯定句中能这样用.) This must be your room. There must be a mistake. 在回答由must引起的问题时.如果是否定的答复.不能用mustn't.而需要用needn't或don't have to.因为mustn't是“一定不要 的意思. 例如: -Must we hand in our exercises today? -No.you needn't. must not的否定形式则表示“不应该 或“不许可 .语气比较强烈. 例如: You mustn't play on the road. You mustn't eat anything until you see the doctor.

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