2015年卫生职称英语备考语法:被动语态的形式
被动语态是由be (助动词)+过去分词(及物动词)构成。be随主语的人称、时态和数的不同而变化。现将被动语态的各种时态形式列表如下(以provide为例)
一般时态 | 进行时态 | 完成时态 | |
现在 | am provided is provided are provided |
am being providedis being providedare being provided |
has been providedhave been provided |
过去 | was provided were provided |
was being provided were being provided |
had been provided |
将来 | shall be provided will be provided |
shall have been provided will have been provided |
|
过去将来 | should be provided would be provided |
should have been provided would have been provided |
红色结构是在职称英语考试中常出现的结构。
注:
①在美语中,will和would可用于各种人称。
②被动语态的一般疑问句和否定句的构成:构成一般疑问句时,将主语后的第一个助动词提至句首; 构成否定句时,将not加在第一个助动词后。例如:
Natural gas has been found in this area.(肯定句)
Has natural gas been found in this area?(疑问句)
Natural gas has not been found in this area.(否定句)
③带有情态动词的被动语态的构成:由情态动词can,may,must等加助动词be,再加过去分词构成。这些情态动词没有人称和数的变化。如:
Such shops can be seen everywhere in the city.
The composition must be finished next week.
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