The fire must be outside.(改成反义疑问句) The fire must be outside_ _ 周天之前

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The fire must be outside.(改成反义疑问句) The fire must be outside_ _ 周天之前

The fire must be outside.(改成反义疑问句) The fire must be outside_ _ 周天之前
The fire must be outside.(改成反义疑问句) The fire must be outside_ _
周天之前

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

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.?
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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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