连接副词：when，where，how，why，whenever，wherever，however。

1.主语从句

在复合句中起主语作用的从句叫主语从句。

(1)that引导主语从句时，在句中不充当任何成分，无词义，只起连接词作用，不能省略；whether/if在从句中也不充当任何成分，但表示疑问含义；连接代词和连接副词在句中既保留自己的疑问含义，起连接作用，又在句中充当句子成分。

That there is adequate water for the cities is important for the industry.

城市有充足的水对工业来说很重要。

Whether the meeting will be held is still a problem.

是否要开会仍是个问题。

What one thinks and feels is mainly due to tradition，habit and education.(What＝The thing which/that)

一个人的思想和感情主要归因于传统、习惯和教育。

Where you went yesterday has nothing to do with me.

你昨天去哪儿与我无关。

Whoever breaks this law deserves a fine.

违反该法者应予以罚款。

(2)it作形式主语，把真正的主语从句放在句末。

It's no surprise that he should have won the prize.

他本来就应该赢得奖品，这并不惊奇。

[题组训练1]

用适当的连接词填空

(1) he wants to tell us is not clear.

(2) will win the match is still unknown.

(3)It is known to us he became a writer.

(4) the English party will be held has not yet been announced.

(5)It's a great pity they didn't get married.

2.宾语从句

在复合句中起宾语作用的从句叫宾语从句。

(1)连接代词what，who，whom，which等在从句中可作主语、宾语、表语和定语等。

Do you know what we should do in the next step?

你知道下一步我们要做什么吗？

(2)连接副词when，where，how，why等引导宾语从句。

The stranger asked where he could buy this medicine.

这个陌生人问在哪里可以买到这种药。