主语从句用什么引导

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"，他在很短的时间内写完作文让我们都很惊讶，此复合句主要描述的是某事让我们惊讶，某事就是该复合句的主语，因此“That he finished writing the composition in such a short time”便是该复合句的主语从句。

常规主语从句，即句子在复合句中充当一个主语

主语从句的时态不受主句时态的影响和限制

（1）That he finished writing the composition in such a short time surprised us all.

他在如此短的时间内写完作文使我们十分惊讶。

（2）Whether we will go for an outing tomorrow remains unknown.

我们明天是否会去郊游仍旧未知。

（3）Who will be our monitor hasn't been decided yet.

现在还没有决定谁会成为我们的班长。

（4）Whom we must study for is a question of great importance.

“我们为谁而学习”是个很重要的问题。

（5）What caused the accident remains unknown.

事故的起因是未知的。

（6）Whatever you did is right.