被动语态(不用被动语态的情形)[

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be worth 后的动名词用主动表被动． e.g. This movie is worth seeing. She is not worth getting angry with. 8.在need, want, require等少数表示“需要” 的动词后的动名词用主动表被动． e.g. The room needs cleaning. These children require looking after.
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ቤተ መጻሕፍቲ ባይዱ
2.当open,
close, shut, lock, move, read, wash, clean, cook, cut, wear, carry等用作不 及物动词且表示主语的某种属性时,通常用主 动表被动. e.g. The window won’t shut. The book sells quickly.
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过去完成时
情态动词 不定式
感官动词和 使役动词的 被动语态
The passive voice
不用于被动语态的情形
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不及物动词没有被动语态
因为不及物动词没有宾语,所以若将其用 于被动语态则没有主语,故不能用于被动语 态.这类动词如take place,happen,come about,breakout,appear,dispear,last( 持续）,arise(出现，发生），date from(date back to)等． e.g. The storm has lasted for 3 hours. The boy disappeared round the corner.
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get+过去分词
e.g. How did that window get opened? Cleaning women in big cities usually get paid by the hour.
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4.某些be
+adj+to do 结构中的不定式通常用 主动表被动． e.g. The poem is difficult to understand. The music isn’t pleasant to listen to. The picture is interesting to look at.
各种时态的被动语态形式
时态名称 一般现在时 一般过去时 一般将来时 过去将来时 现在进行时 过去进行时 现在完成时
被动语态形式 am/is/are+过去分词 was/were+过去分词 will/shall+be+过去分词 would+be+过去分词 am/is/are+being+过去分词 was/were+being+过去分词 have/has+being+过去分词 had+been+过去分词 can/may/must/need/should…+be+过去分词 to be+过去分词 be+seen/heard/noticed/found/watched/ observed/let/had/made+to do
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主动表被动的若干情形
１.连系动词(如
look,sound,smell,feel,taste,prove等)用主动 表被动,因为系动词为不及物动词, 它们没有 被动形式. e.g. The garden looks very beautiful. You idea proved to be wrong.
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6.在too…to
do sth 和…enough to do sth 这 两个结构中,若句子的主语与其后的不定式为 被动关系,则该不定式通常用主动表被动. e.g. The writing is too faint to read. These boxes are not strong enough to use as a platform.
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3.不定式to
blame, to let 用作表语时,主动表
被动. e.g. Who is to blame? The house is to let.
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7.
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More than a dozen students in that school____aboard to study medicine last year.
sent were sent had sent had been sent
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With more forests being destroyed, hug quantities of good earth ___ each year.
is washing away is being washed away are washing away are being washed away
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5.不定式用于某些动词（如have,
have got, get, want, need等)的宾语后作定语时,如果 不定式的逻辑主语是句子的主语,通常用主动 表被动. e.g. I have some clothes to wash. I have something to drink.