It+be+adj. + of sb. to do sth. =sb. be + adj. + to do sth. (常见形容词:clever, silly, foolish, stupid, wise, kind, rude, impolite,careless, cruel, crazy, etc.) 3、常用动名词做主语的句型有: It’s no good (use, fun) doing sth. It’s (a) waste of time...
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