if you smell gas in your house,you have to act immediately.y

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/18 20:50:16

if you smell gas in your house,you have to act immediately.you() not delay.
为什么不是could ,will must,而是might?

1、could not 含两种意思：“推测出来的不可能性”或“不具备的能力”.如果用 could,意思成了“你一定不会耽搁”或“你没有耽搁的能力”.
　　2、will must 不仅没有这种用法,而且结构也不对.情态动词和助动词同时出现在一个句子时,应该是情态动词在前助动词在后.如：
　　He must be at home.他一定在家.
　　The work can’t be delayed.这项工作不能耽搁.
　　They may be playing.他们也许正在玩耍.
　　3、might表示“许可性”,you might not delay 的意思则是“不允许你耽搁”,正好呼应了上文“如果在家里闻到煤气味,你得马上采取行动”所表达的意思.
再问： can也表示允许(和may意思相近)，意思是：可以，能够。字典里这么写得啊
再答：表示推测有两种用法——must 表示有把握的推测，意思是 “必定”，否定句或疑问句用 can/could。如：He must be at home.He can't be at home.Can he be at home?
may/mght 表示把握不大的推测，意思是 “或许/大概”，否定和疑问句还用 may /might 。如：He might be at home.He might not be at home.Might he be at home?

再问：那表示许可呢？can may有什么不同吗》
再答：表示许可时用 may。表示强制用 must，must 的否定是 may not。

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