He was seen to enter the roon just now.这里为什么要有to啊?

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He was seen to enter the roon just now.这里为什么要有to啊?
另外总结下see的用法及被动语态.
see sb do sth我记得貌似有这个

解析如下：
See sb do sth 只是其中一种用法
See 后面可以跟“宾语+do/doing/done 即非谓语动词的三种形式.
1)I saw him steal vegetables yesterday.
昨天我看见他偷菜了.(强调"我看见了"这个事实)
2)I saw him stealing vegetables yesterday.
昨天我见他正在偷菜.（强调"我见他正在偷"这个动作）
3)I saw him brought in by the police yesterday.
昨天我见到被带进了警察局 (逻辑上宾语he 与bring in是一种被动关系,故用过去分词)
整多了!希望提问者不要混乱.Let's go to the point.
See sb do sth 其中动词原形do,其实质是省略"to"的不定式.当变成被动句时
不定式"to”不能省略.
If you still feel confused ,leave a message please

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