2015职称英语考试常用语法详解第五讲(动词非谓语形式)_职称英语备考指南

　　3) As he did not want to hurt her feelings, he did not tell the truth at the moment.

　　Not wanting to hurt her feelings, he did not tell the truth at the moment

　　规则：非谓语动词的否定式是在非谓语动词前面(不是后面)加not构成;其他变化按照例1)或例2)规定

　　4) As she has lived in China for over 20 years, she can speak Chinese fluently.

　　Having lived in China for over 20 years, she can speak Chinese fluently.

　　As they had not finished the lessons, the students had to give up going to see the play.

　　Not having finished the lessons, the students had to give up going to see the play.

　　规则：当句子中出现1)for + 时间状语，或2)当一个行为必须在另一个行为结束后才能开始的情况下，应该用完成式，否定词 not 要放在having的前面，即Not having

　　提示：当你在考试时分不清是否要用完成式时，应倾向于选择有完成式的选项。

　　5) If weather permits, well go out for a picnic tomorrow.

　　Weather permitting, well go out for a picnic tomorrow.

　　When all necessary data had been collected, they began the experiment.

　　All necessary data having been collected, they began the experiment.

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