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被动语态的区别

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为什么有的被动语态动词的过去分词前面有be动词,有的没有
被动语态的区别
解题思路: 如下
解题过程:
被动语态的特殊情况:  有些动词如(read, write ,clean, wash,clean,iron,burn,draw,cook,keep,cut, open,peel,sell,act)等,常和副词(smoothly, easily, well)等连用,且经常用主动表被动,这些动词的主语通常是表示物的词,表示这种物内在所具有的某种特点。这些句子的时态多用一般现在时或一般将来时:
Eg: This pen writes smoothly.
 In hot weather meat won’t keep long.
 The door can’t open .
 The cloth washes well.
 Clothes iron more easily when damp.
 有些动词,如(cook, print, do)等,常用主动结构的进行时表被动含义。
Eg:The cake is baking.
 The lunch is cooking.
 The book is printing.
 Fish is selling briskly.
 有些动词(need, require, want, deserve, be worth )后续Ving,用主动形式表被动含义。这些词的主语一般为物,表该物自身的一种需求。
Eg: My bike needs repairing.
 Who said the boy deserves punishing.
 有些系动词(feel, prove, smell, taste, sound, look)后跟形容词,也可用主动形式表被动意义。
Eg: Your suggestion proved quite effective.
省略to的动词不定式,在变为被动语态时需要把to还原。
Eg: He make his son play the violin two hours a day. ( make sb do sth)
被动语态:His son is made to play the violin two hours a day.

最终答案:略