See的被动语态要用什么形式

see sb. doing sth.看见某人正在做某事的被动语态就是：sb be seen doing sth例如：Huruixin was seen copying the homework

see的被动语态为seen.

例句：We saw him play football on the playground.--> He was seen to play football on the playground.

see，watch，notice，hear，feel，observe等这些在被动语态里都要还原to，这些动词都是及物动词，有被动语态的.它们后面不带to 的不定式在被动语态中都要将to 还原.例如：We often see him play basketball .-----He is often seen to play basketball by us. feel 可以做及物动词，也可以做不及物动词。当feel 做及物动词时可以用被动语态。

例如：I can feel a nail in my shoe.我感到鞋里有一颗钉子。 ---A nail can be felt (by me) in my shoe.