The man was seen running out

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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?

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.

The man was seen running out The middle -age man was seen ( )out of the house on the afte Jim was seen () out of the room The young man was running in the street very fast The young man was ofen seen draw by the river. the old man was often seen ___ by the lake The young man was often seen _C____ by the lake. the young man was seen to ___(run)just now The man was seen ____ there ____,doing nothing. the man was seen ____ away with something Jim was seen _____(go) out of the room. 几道高一句型转换 1.The red car was seen running towards the western