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。