一般现在时,主动：1、am,is,are 2、动词用原形,单三要+s或es 被动：am,is,are+动词的过去分词（ved）
一般过去时,主：1、was,were 2、动词的过去式 被：was,were+ved
一般将来时,主：will,shall+动词原形 被：will,shall+be+ved
现在进行时,主：am,is,are+动词的现在分词 被：am,is,are+being+ved
过去进行时,主：was,were+动词的现在分词 被：was,were+being+ved
现在完成时,主：have,has+动词的过去分词 被：have,has+been+ved
还有一些情况不能同被动语态的：
1.不及物动词不能用于被动语态.例如：
【误】 The story was happened in London.
【正】 The story happened in London.
2.表示状态的动词,如have,cost,fit,last,own,hold,become等往往不能用于被动语态.例如：
【误】 He is fitted very well by the shirt.
【正】 The shirt fits him very well.
3.某些“不及物动词 + 介词”型的短语动词,如listen to,walk into,fall off等,往往不使用被动语态.例如：
【误】 The room was walked into by him.
【正】 He walked into the room.
4.祈使句一般没有被动语态.例如：
【误】 The blackboard is looked at by you.
【正】 Look at the blackboard,please.
5.主语和宾语所指的对象相同时不能用于被动语态.例如：
【误】 Each other must be helped by us.
【正】 We must help each other.
6.某些及物动词的宾语表示处所、地点、组织时不能用于被动语态.例如：
【误】 The League was joined by him in 1998.
【正】 He joined the League in 1998.
7.动词不定式或V-ing形式作宾语时不能用于被动语态.例如：
【误】 To watch TV is liked by them.
【正】 They like to watch TV.
【误】 Listening to the radio is enjoyed by him.
【正】 He enjoys listening to the radio.
8.主动句中有表示数量、长度、大小或程度的单词或短语作宾语时往往不使用被动语态.例如：
【误】 Three yuan is paid for these tomatoes by her.
【正】 She pays three yuan for these tomatoes.
9.由“动词 + 名词”构成的短语动词,如make faces,make friends,take place等,一般不可用于被动语态.例如：
【误】 Faces are often made by the boy in class.
【正】 The boy often makes faces in class.
10.反身代词在句中作宾语时,不能使用被动语态.例如：
【误】 Yourself must be looked after by you.
【正】 You must look after yourself.
