She was heard __A______ an English song.A.to sing B.sing C.sang D.to be sang 写下详解(语法)

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She was heard __A______ an English song.A.to sing B.sing C.sang D.to be sang 写下详解(语法)

She was heard __A______ an English song.A.to sing B.sing C.sang D.to be sang 写下详解(语法)
She was heard __A______ an English song.A.to sing B.sing C.sang D.to be sang 写下详解(语法)

She was heard __A______ an English song.A.to sing B.sing C.sang D.to be sang 写下详解(语法)
这个句子是hear somebody do something所变成的被动结构.在主动结构中,动词不定式做hear的宾语补足语时,要省略to,但在变成被动结构时,动词不定式符号to就不能省了.

该句是被动语态,主动形式用hear sb do sth,但变为被动形式时必须带to
这是被动语态的一种特殊情况。

主动变被动还原to ,be heard to do sth

A She ( was ) ( heard )( to ) ( sing ) an English song.
由They ( heard )(her ) ( sing )an English song.变化而来。
此为主动语态变为被动的几个特殊情况之一

① 有些动词在主动结构中,后面接不带to的不定式,但如果改为被动,则需把省略...

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A She ( was ) ( heard )( to ) ( sing ) an English song.
由They ( heard )(her ) ( sing )an English song.变化而来。
此为主动语态变为被动的几个特殊情况之一

① 有些动词在主动结构中,后面接不带to的不定式,但如果改为被动,则需把省略的to加上,这类动词有 [let, make, have,help]和感官动词[feel,see,hear,watch,look at,listen to],如:The boss made my grandfather work 10hours a day.改成My grandfather was made to work for 10 hours a day.

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