一、主语从句的定义：
在复合句中充当主语的句子叫做主语从句。
二、常规主语从句示例：
连词that引导
1)That he finished writing the composition in such a short time surprised us all.
他在这么短的时间内完成了写作震惊了我们所有人。
2)That he is still alive is a wonder. 他还活着，真是奇迹。
3)That we shall be late is certain. 我们要晚了，这是确定无疑的。
4)That he should have ignored the working class was natural.
他忽视工人阶级是很自然的。
5)That she became an artist may have been due to her father’s influence.
她成为画家可能是受她父亲的影响。
6)That you are coming to London is the best news I have heard this long time.
你将来伦敦是好久以来我听到的最好消息。
7)That she was chosen made a tremendous stir in her village.
她被挑选上，在她村子里引起很大轰动。
连词whether 引导
1)Whether we will go for an outing tomorrow remains unknown.
我们明天是否外出仍未可知。
2)Whether it will do us harm remains to be seen. 是否对我们有害还要看一看。
3)Whether they would support us was a problem. 他们是否会支持我们还是一个问题。
3. 关系代词型What引导
1)What caused the accident remains unknown. 什么原因引起了这场事故尙不清楚。
2)What we nee is time. 我们需要的是时间。
3)What we need are good doctors. 我们需要的是优秀的医生。
4)What’s done is done. 事已成定局。
5)What he says is not important. 他说的话并不重要。
6)What I am telling you is mere impressions.
我和你说的都不过是一些印象而已。
7)What make the river more beautiful are the lotus plants growing in the water.
为河水增色的是水里的荷花。
4. 连接代词引导
1)Whoever is top from wins the game when two matched players meet.
两强相争勇者胜。
2)Whichever (of you) comes in first will receive a prize.
无论(你们)谁先到都可以得奖。
3)Whichever you want is yours. 你要哪个哪个就是你的。
4)Whatever you did is right. 无论你做什么都是对的。
5. 连接副词引导
1)When we arrive doesn’t matter. 什么时候到没有关系。
2)How this happened is not clear to anyone. 这件事怎样发生的，谁也不清楚。
3)How many people we are to invite is still a question. 邀请多少人还是一个问题。
4)Where I spend my summer is no business of yours. 我在哪里过暑假不关你的事。
6. 关系代词Who, whom, whose引导
1)Whose watch was lost is unknown. 谁的表丢了还不知道。
2)Who will be our monitor hasn’t been decided yet. 谁将是我们的班长还没有决定。
3)Whom we must study for is a question of great importance.
我们必须向谁学习是一个非常重要的问题。
三、常规主语从句语法规则小结：
1. 引导主语从句的连词有that, whether, who, whose, whom, what, whatever等。
2. 连词位于句首不能省略。
3. 主语从句大多数情况下视为“三单”(第三人称单数)，但也有例外，如例3. 3)和3. 7)。
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