如题所述
被动语态的基本结构为：be+done.
根据主动语态不同时态不同。具体如下：
一般现在时
主动： Sb. do/does sth. eg: I do my homework./ He does his homework.
被动：Sth. am/is/are done (by sb.). eg: Homework is finished by me.
一般过去时
主动： Sb. did sth. eg: I did homework./ He did homework.
被动：Sth. was/were done (by sb.). eg: Homework was done by me.
现在进行时
主动： Sb. am/is/are doing sth. eg: I am doing my homework./ He is doing his homework.
被动：Sth. am/is/are being done (by sb.). eg: Homework is being done by me.
过去进行时现在完成时
主动： Sb. was/were doing sth. eg: I was doing my homework.
被动：Sth. was/were being done (by sb.). eg: Homework was being done by me.
现在完成时
主动： Sb. have/has done sth. eg: I have finished my homework./ He has finished his homework.
被动：Sth. have/has been done (by sb.). eg: Homework has been finished by me.
过去完成时
主动： Sb. had done sth. eg: I had finished my homework./ He had finished his homework.
被动：Sth. had been done (by sb.). eg: Homework had been finished by me.
一般将来时
主动：Sb. will do sth. eg: I will do my homework.
被动： Sb. will be done. eg: Homework will be done by me.
过去将来时(少用)
主动：Sb. would do sth. eg: I would do my homework.
被动： Sb. would be done. eg: Homework would be done by me.
Hope my explanation will help you.
was/were+ 过去分词
I was bought a present yesterday.
They were told not to do that.
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