2015年卫生职称英语备考语法：被动语态的形式
2015-02-03 16:54 来源：医学教育网
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.
相关资讯
