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watch out the glass与watch out for the glass辨误
1.watch out If you tell someone to watch out, you are warning them to be careful, because something unpleasant might happen to them or they might get into difficulties. You have to watch out because there are land mines all over the place. The casinos in Las Vegas had better watch out...
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情态动词表推测或可能性时用肯定句、否定句和疑问句的区分
mustn't用于否定句表示禁止做……。will 和would 均可以用于肯定句和疑问句，如果作为情态动词的话表示一种意愿，“想要……”。should表示应该，shouldn't用在否定句中可以。ought to 与should 类似。疑问句中少见。
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