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）