2、结构 be+过去分词”并不一定都是被动语态，有时是系表结构。被动语态,动作的对象是主语；当“be +过去分词”表示主语所处的状态时为系表结构，be是连系动词。be后面的过去分词是表语，相当于形容词。其区分办法如下： 1, 如果强调动作或句中有介词by引导出动作的执行者，该句一般为被动语态。The glass is broken.(系表结构) The glass was broken by the boy.(被动语态) 2 ，如果句中有地点、频率或时间状语时，一般为被动语态The magazine is published in Shanghai.。(被动
3、语态)The door is locked.(系表结构)The door has already/just been locked.(被动语态)The shop is opened.(系表结构) The shop is opened at 8 a.m. everyday.(被动语态) 3 ，被动语态除用于一般时态和完成时态外，还可以用于其他各种时态，而系表结构中的系动词be只有一般时态和完成时态。 三、被动语态的用法 1 不知道或没有必要说明动作的执行者是谁。 Some new computers were stolen last night. This boo
4、k was published in 1981. 2 强调动作的承受者，而不强调动作的执行者。 This book was written by him. Eight hours per day for sleep must be guaranteed. 四、主动语态变被动语态的方法 1 把主动语态的宾语变为被动语态的主语。 2 把谓语变成被动结构(be＋过去分词)，根据被动语态句子里的主语的人称和数，以及原来主 动语态句子中动词的时态来决定be的形式。 3 把主动语态中的主语放在介词by之后作宾语，将主格改为宾格。All the peopl
5、e laughed at him.= He was laughed at by all people. They make the bikes in the factory.= The bikes are madeby themin the factory. 五、含有情态动词的被动语态 含有情态动词的主动句变成被动句时，由“情态动词＋be＋过去分词”构成，原来带to的情态动词变成被动语态后“to”仍要保留。 We can repair this watch in two days. = This watch can be repaired in tw
6、o days. You ought to take it away. = It ought to be taken away. They should do it at once. = It should be done at once 一．选择填空1.Insomecountries,tea______withmilkandsugar.A.isservingB.isservedC.servesD.served2.Greatchanges_____inmyhometownsince1980.A.havebeentakenplaceB.tookplaceC.haveta
