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动词know后的不定式符号to的省略问题 | |||
作者:HWD 文章来源:本站原创 点击数: 更新时间:2015/11/14 |
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动词know后的不定式符号to的省略问题 当动词know的后面跟有不定式作宾语补足语时(即用于“know+宾语+不定式”),该不定式有时带to,有时不带to,具体用法如下: (1) 若know为一般现在时,则其后用作宾语补足语的不定式不能省略to(此时的不定式通常为to be型)。如: I know him to be ill. 我知道他病了。 We know her to be honest. 我们知道她是诚实的。 (2) 若know为一般过去时或现在完成时,则其后用作宾语补足语的不定式可以省略to,也可以保留to(此时的不定式可以是to be型,也可以是to do型)。如: I never knew him (to) do such a thing. 我从未听说他会干那种事。 I’ve never known her (to) be late before. 我以前从不知道她迟到过。 I’ve never known it (to) snow in July before. 我从未听说过有七月下雪的事。 I have never known a horse (to) eat fish. 我没听过马会吃鱼。 但是,当用作宾语补足语的不定式为完成式时,其中的to不能省略。如: They knew the man to have been a thief. 他们发现此人曾是个小偷。 I have never known her to have failed. 我从来没发现她失败过。 (3) 当动词know本身用于被动语态时,其后的不定式不能省略to。如: He has never been known to tell a lie. 从未有人听说过他说谎。 Smoking is known to increase a person’s risk of developing lung cancer. 据说吸烟会增加一个人患肺癌的风险。 People have been known to drive 500 miles just to visit the shop. 听说有人驾车500英里只是为了去这家商店。 |
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