题目内容：

I think it important to keep healthy 与I think it is important to keep healthy 区别

优质解答

前一句没有从句,后一句有从句.
前一句中it是形式宾语,代指to keep healthy,important是宾补.
后一句中,it is...healthy是think的宾语从句,由that引导（已省略）,it是从句中的形式主语,代指to keep healthy,is important是从句中的表语.