宾补和主补?

A child was seen to enter the building.
They are believed to have discussed the problem.
这两句中不定式是做宾补还是主补?为什么有的资料说是做宾补?

主补即主语补足语即被动语态中的宾语补足语。
eg.They caught boy stealing.
被动语态
The boy was caught stealing.
stealing即为主语补足语
get better是对pet的补充,所以是宾补
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