Question

i think （）important to tell him about it.,为什么不是it‘s呢一般做形式主语都

Answer 1

两个答案都可以,都对,句子结构不同,分析如下：

I think it important to tell hime about it.是简单句,第一个it是形式宾语,为真正宾语.

I think it is important to tell hime about it.是主从复合句,it is important to tell hime about it.是宾语从句,从句中,第一个it是形式主语,to tell hime about it.作真正主语.