I saw him going to the office .的被动语态怎么改?是He was seen to going to the offi...

I saw him going to the office .的被动语态怎么改?是He was seen to going to the offi...

题目
I saw him going to the office .的被动语态怎么改?是He was seen to going to the offi...
I saw him going to the office .的被动语态怎么改?是He was seen to going to the office.感官动词接doing的被动语态形式怎么改?
答案
He was seen going to the office,不用加to
see sb,do sth,变被动时要加to,而see sb,doing 变被动时不加to
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