关于It is +adj+to do sth的问题

1`选择题：I don't think _____ necessary to tell you about it.
A.this B.that C.him D.it
2`用括号内所给中文的适当形式填空
I think it ______ (必要的）to learn English well.
想问一下，能不能说It necessary to learn English well?如果这样的话，老感觉缺个动词。

It is+adj/n+to do it's +adj+to do sth It's + adj+to do sth It isn't +adj+to do sth it's adj doing 和it's adj to do的区别 It is adj for(of) somebody to do it is +adj +for sb +to do 造句 写翻译 It is +adj +to do 有这个句型么? It is +adj+for sb.+to do sth. 与 It is +adj +of sb.+to do sth. 的区别？ it's adj for sb to do和of sb to do有什么不同 find it +adj to do 什么意思？