被动语态..

只学到被动语态的话,这些时态就够了.按照时态要求有的句子可能有点奇怪,或者语境下不常用
一般过去式（昨天吃了一个苹果）：
I ate an apple yesterday.（主动语态）
An apple was eaten by me yesterday. （ 被动语态）
一般将来时（明天吃了一个苹果）：
I will eat an apple tomorrow.(主动)
An apple will be eaten tomorrow.(被动)
一般现在时（我刚刚吃了,或者不强调时间）：
I eat an apple.(主动)
An apple is eaten .(被动)
现在进行时（我正在吃）：
I am eating an apple now.(主动)
An apple am being eaten now.(被动)
现在完成时(我刚刚已经吃了一个了)：
I have just eaten an apple.(主动)
An apple has been eaten.(被动)
过去完成时（昨天之前就已经吃了）：
I had just eaten an apple before yesterday.(主动)
An apple had been eaten before yesterday.(被动)

其余时态：
过去进行时（那是我正在吃苹果）：
I was eating an apple then.(主动)
An apple was being eaten then.(被动)
将来完成时（明天那时我已经吃了一个苹果了）：
I will have eaten an apple by the moment.(主动)
An apple will have been eaten by the moment.(被动)
将来进行时（明天这时我正在吃苹果）：现进和情态呢？说完给你分情态动词：must(必须)I must eat an apple.（主动）An apple must be eaten .(被动)have to （不得不）I have to eat an apple.（主动）An apple has to be eaten .(被动)should(应该)I should eat an apple.（主动）An apple should be eaten .(被动)ought（应该）I ought eat an apple.（主动）An apple ought be eaten .(被动)need（需要）I need eat an apple.（主动）An apple need be eaten .(被动)或者An apple needseating.或者An apple needs to be eaten.need上面的第一个句子是作为情态动词使用，后面两个是作为使役动词使用的。