关于主语补足语的问题.U are supposed to do sth.这里to do sth是不是主语补足语,A child was seen to enter the building.to enter the building是主语补足语吗?U will be helped to push the cart.to push the cart.主语补足语?

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关于主语补足语的问题.U are supposed to do sth.这里to do sth是不是主语补足语,A child was seen to enter the building.to enter the building是主语补足语吗?U will be helped to push the cart.to push the cart.主语补足语?
关于主语补足语的问题.
U are supposed to do sth.
这里to do sth是不是主语补足语,
A child was seen to enter the building.
to enter the building是主语补足语吗?
U will be helped to push the cart.
to push the cart.主语补足语?

关于主语补足语的问题.U are supposed to do sth.这里to do sth是不是主语补足语,A child was seen to enter the building.to enter the building是主语补足语吗?U will be helped to push the cart.to push the cart.主语补足语?
以上都是主语补足语.
主语补足语和宾语补足语可以这样加以区别:
被动语态的主语补足语与主动语态的宾语补足语是密切相关的.例,
(1) I saw him playing basketball yesterday.
(2) He was seen playing basketball yesterday.
句(1)中的含义不是我看见他,而是我看见他正在打篮球.playing basketball是宾语him的补足语.所以叫宾语补足语.
句(2)中的含义也不是他被看,而是别人看见他正在打篮球.这里的playing basketball是主语he的补足语,故称作主语补足语.
主语和主语补足语一起称作复合主语.所以含有主语补足语的句子一般是被动语态,谓语动词是可以接复合宾语(宾语+宾语补足语)的及物动词.句首的主语就是主语补足语的逻辑主语.
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