The man was seen running out为什么用“running”而不用“to run”呢?这是怎样的一个时态呢?

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The man was seen running out为什么用“running”而不用“to run”呢?这是怎样的一个时态呢?
The man was seen running out
为什么用“running”而不用“to run”呢?这是怎样的一个时态呢?

The man was seen running out为什么用“running”而不用“to run”呢?这是怎样的一个时态呢?
这句话是被动语态,主动语态的结构是：
see sb.do或者see sb.doing
see后面的结构都叫复合宾语--宾语+宾语补足语,因此do和doing都是宾语补足语.
变成被动语态后,宾语sb.成了主语,后面的宾语补足语就成了主语补足语.其结构分别为：sb.is/was seen to do
sb.is/was seen doing
这两个结构中的do(被动语态中是to do)和doing虽然充当的成分是一样的,但是它们的意思是不一样的：do(被动语态中是to do)表示该动作已完成；doing表示过程,该动作未完成.
如：
Tom saw his parents get into the car and drive off.
get和drive都是动词不定式做宾补表示完成和结束.
I saw her crying when I came into the classroom.
crying是现在分词做宾补,表示正在进行,未完成.表示看到的只是一个过程.
She was seen running away from the scene of the crime.有人看见她从犯罪现场跑开.
running现在分词做宾补,强调看到的是正在跑的过程.
你的这句话就属于这样一种用法.它是一般过去时的被动语态形式.

这句话是有一定的错误的。。。。虽然 see sb doing sth 是一个固定搭配。。。 但单出现被动时。。。可用 sb was/were seen to do sth
也就是说，当处于被动式时，see后是可以加to do sth 的

run out强调的是动作的瞬间，see sb （to） do强调动作的全过程而see sb doing sth 强调动作的瞬间。

see sb. doing sth. 固定搭配，这里只不过把sb.提前，写成了被动语态

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