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    • The fire must be outside.（改成反义疑问句） The fire must be outside_ _ ?

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    推荐答案   2011-06-25
    答案：The fire must be outside, isn't it?

    解释：此句中的must表示肯定的推测，此时其反义疑问句和must无关，必须根据具体语意和语境来选择。
    must be指对现在情况的推测，如果是对过去情况的推测，必须用must have been.
    所以需要把原句变为：The fire is outise，所以其反义疑问句为：isn't it?

    参考资料：英语牛人团

    温馨提示：答案为网友推荐，仅供参考
    其他回答
    第1个回答  2011-06-25
    帮你归纳一下must的用法：
    （1）表必须，即情态动词时反义疑问句用needn't sth.?
    (2)表推测时，看must后面的时间点
    1，若有明显的过去时间，则用didn't sth.?
    2,若无时间标志，看must后面的语言点。若有be动词，则用isn't sth.?
    若有have been,则用haven't /hasn't sth.?
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