不完全及物動詞如: find ; consider ; think ; make 等不得直接接不定詞片語做受詞.需使用it做虛受詞,再接不定詞片語:

結構如下:

find it + 形容詞/名詞 +to V

consider it + 形容詞/名詞 +to V

think it + 形容詞/名詞 +to V

make it + 形容詞/名詞 +to V

例:

I find it necessary to study English.

I think it a lot of fun to work with him.

The delay makes it necessary for us to work overtime.