I think it good to do exercise.和 I think that it is good to do exercise.区别是?

问题描述:

I think it good to do exercise.和 I think that it is good to do exercise.区别是?
I think it good to do exercise.和 I think that it is good to do exercise.区别是什么?另外,后者这个句子由that引导宾语从句,引导词that应该是可以省略的吧.那如果省了,不就成了 I think it is good to do exercise.那在做题的时候,如何理解这两个句子的结构?
我知道
①前者的结构是:
主语 + think/find/believe + it + 形容词 + to do
(主语) (谓语) (形式宾语)(宾补) (真正的宾语)
②后者是that引导一个宾语从句.

①前者的结构是:
主语 + think/find/believe + it + 形容词 + to do
(主语) (谓语) (形式宾语)(宾补) (真正的宾语)
it是形式宾语,不定式才是真正的宾语
②后者是that引导一个宾语从句.