find“发现”用法如下：
find+sb/sth+n/adj/adv/doing/done/介词短语或find+sb/sth+(to be)n/adj/adv/介词短语.
注：find后不跟to do作宾补,但可以跟to be+n/adj/adv/介词短语作宾补,且to be可以省略.
eg:I find him(to be)a good boy.
I find him (to be)very clever.
I find him (to be)outside.
I find him (to be)outside the classroom.
I find him studying in the room.
I find him biten by a dog.