1.主语从句的引导词有what、which、whose、when、whether、if、where。
2.引导主语从句的连词主要有:从属连词:that whether。连接代词:who、whoever、whom、whose、what、whatever、which、whichever。连接副词:when、where、how、why、whenever、wherever、however。主语从句,即在复合句中充当主语成分的句子,例如That he finished writing the composition in such a short time surprised us all。