之前有简单地讲过了被动语态，这个章节二番解析不同时态和一些细枝末节。
我们用主动动词来表达主语的动作：
- Somebody built this house in 1930. (主语somebody，主动动词built)
我们用被动动词来表达主语的变化：
- This house was built in 1930.(主语this house，被动动词was built)
如果我们想说“谁或者什么导致了这个行为”，使用“by”进行衔接。
- This house was built by my father.
- Two hundred people are employed by the company.
根据上面的例子也能看出，被动语态的结构可以是：
be(is/was/have been...)+动词过去分词
最常使用的被动语态时态分别有：
一般现在时被动语态： am/is/are+动词过去分词
- I'm often invited to party.
我经常被邀请去派对。
- This room is cleaned everyday.
这间房天天有打扫。
- Many accidents are caused by dangerous driving.
许多交通事故都是因为危险驾驶造成的。
一般过去时被动语态：was/were+动词过去分词
- How much money was stolen?
多少钱被偷了？
- We were woken up by a loud noise last night.
我们昨晚被一声巨响吵醒了。
现在完成时被动语态：have/has been+动词过去分词
- The room looks nice. It has been cleaned.
这间房看起来很棒，是已经被清洁过了的。
- I have been bitten by a dog.
我曾经被狗咬过。
过去完成时被动语态：had been+动词过去分词
- The vegetalbes had been cooked for too long, it tasted terrible.
这些蔬菜被煮得太久了，尝起来很不好。
- The car hadn't been used very much.
这辆车没有经常被使用。
现在进行时被动语态：am/is/are being+动词过去分词
- There's somebody walking behind us, I think we are being followed.
有人跟在我们后面，我想我们被跟踪了。
- The room is being cleaned at the moment.
这间房间正在被打扫。
过去进行时被动语态：was/were being+动词过去分词
- The room was being cleaned at 8:00 this morning.
这间房间早上8点的时候有人在清洁。
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