2017年6月英语四级语法知识：各种时态下的被动语态
首先，被动语态由be+过去分词构成，be随时态的变化而变化。下面我们以give为例，各种时态的被动语态形式为：
一般现在时：am/is/are+given
The first section of New College English is designed for speaking practice
and is based on pictures and topics.
一般过去时：was/were+given
These computers were made in our own country.
一般将来时：will/shall be+given
Shall we be asked to attend the opening ceremony?
过去将来时：would be+given
The news would be sent to the soldier's mother as soon as it arrived.
现在进行时：am/is/are being+given
The machine is being repaired in the workshop. The fifth generation
computers, with artificial intelligence, are being developed and perfected
now.
过去进行时：was/were being+given
The feast was being prepared when the birds arrived in the sky
现在完成时：has/have been+given
Swift progress has also been made in culture and education.
过去完成时：had been+given
The huge bridge had been damaged before the World WarⅡ.
将来完成时：will/shall have been+given
The book will have been published by the end of next month.
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