摘要：1． 被动语态的构成 由于不及物动词不能带宾语.故无被动语态.只有及物动词或相当于及物动词的动词短语才有被动语态.其基本构成方式是“助动词be+过去分词 . 注意:“be+过去分词 结构不一定都是被动语态.有些动词(如 be.feel.look.seem等)后面的过去分词已转化为形容词.用作表语表示状态. 如: My bike is broken． The door is open．
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观察下列句子中的画线部分，归纳出各种时态的被动语态的构成。
1．Rice is grown in the south of China．
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2．The computer is being used now．
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3．The work has been finished．
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4．The thief was caught yesterday．
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5．The girl was being operated on in the hospital．
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