1.一般现在时的被动语态：
We are given a lot of homework to do.
我们有很多作业要做。
2.一般过去时的被动语态：
They were given a warm send-off.
他们受到热烈的欢送。
3.现在进行时的被动语态：
I think we are being followed.
我想有人在跟踪我们。
4.过去进行时的被动语态：
They told me that the case was being investigated.
他们告诉我案子正在调查。
5.现在完成时的被动语态：
The documents for which they were searching have been recovered.
他们找寻的文件已找到了。
6.过去完成时的被动语态：
He asked if Mary had been sent to hospital.
他问玛丽是否已被送进医院。
7.一般将来时的被动语态：
Check carefully, so any mistakes will be caught.
仔细检查一遍，把所有错误都找出来。
8.过去将来时的被动语态：
He knew he would be punished for it.
他知道他会为此受到惩罚。
9.含有情态动词的被动语态：
Tables can be made of stone.
桌子可由石头制造。
