i think it diffiult to study english 这句话省略 is 是什么情况?

i think it diffiult to study english 这句话省略 is 是什么情况? I think it important to study English well.与I think it is im I think it important for us to do something 什么情况下is可以省略吗? I think it's(use)to study English well i think study english is very difficult.这句话有问题么?快来救命啊, I think it is easy to study Chinese. I think it is h＿＿＿ for our English study . I think it good to study with a group为什么是it不是it is?to study 1.We think that it is important to study English well.（改简单句） We think it is important for us students to study English we It is hard to study English g______well. I think study grammar is the best way to learn English.Becau