主语+be+形容词+that从句（that从句是原因状语从句，也有语法家认为是宾语从句）
I am glad that you have entered Beijing University.
It +be +形容词+that从句（that从句是主语从句，it是形式主语）
It is necessary that we should take action.
主语+及物动词+it+形容词+that从句（that从句是真正的宾语从句，it是形式宾语）
We find it important that we should study English.
主语+及物动词+宾语 +形容词+that从句（真正的宾语从句，it是形式宾语）
We find her confident that she can succeed. (that从句是是原因状语从句，也有语法家认为是宾语从句）