被动语态的句子是以 be动词+过去分词 的形式来表达.有十种时态:
1.一般现在时 History is made by the people.
2.一般过去时 These cars were made in Tianjing in 1996．
3.一般将来时 Li Ming will be asked to attend the lecture.
4.现在进行时 A new railway is being built.
5.过去进行时 The roads were being widened.
6.现在完成时 （略）
7.过去完成时 （略）
8.过去将来时 （略）
9.现在将来完成时 （略）
10.过去将来完成时 （略）