表语从句和宾语从句
放在Be动词后面的是表语从句：what I thought his answer would be,表语从句中有嵌套了宾语从句.行为动词thought后面的是宾语从句：his answer would be what. 由于what是特殊疑问词,所以要置于句首,那就是：I thought his answer would be.