为什么常用i find it interesting 而不常用i find it's interesting?

只有find+st+adj这种用法
附find用法：1.find +宾语+现在分词
She found a wallet lying on the ground.
她发现一只钱包在地上.
2.find +宾语+过去分词
He found the place much changed.
他发现这地方有了巨大的变化
3.find +（宾语）+形容词
She was found alone in the room.
发现她一个人在屋里.
4.find +宾语+副词
I”m so glad I found you in.
发现你在家我真高兴.
5.find +宾语+介词短语
They found him already in the care of a doctor.
他们发现已经有一位大夫在照顾他了.
6.find +宾语+名词
You will find it a difficult book.
你将发现这是一本难懂的书.
7.find +宾语+to be
This method was found to be practicable.
大家发现这方法很可行.

find作动词时,宾语不只能是名词性质的比如名词,代词,动名词或that引导的从句...it`s　interesting不能作为宾语,如果要作宾语,必须加一个引导词..I find that it`s interesting.(√)此时find是不及物动词,后面that不能省略...当然本句也可以这样表达:i find it interesting..此时,find 是及物动词,it是宾语,int...

因为是从局