点击免费领取中考核心考点资料！

　　一、主语从句的概念与类型

　　主语从句在复合句中作主句的主语,引导主语从句的词有从属连词that, whether以及连接代词who, what, which, whoever, whatever, whichever和连接副词when, where, why, how等. 例如:

　　That she was chosen made us very happy.

　　她当选了使我们很高兴.

　　What caused the accident is a complete mystery.

　　是什么导致了这次事故还完全是一个谜.

　　Whether she will come or not is still a question.

　　她是否来还是一个问题.

　　Which team will win the match is still unknown.

　　哪个队会赢得这场比赛还不知道.

　　Whoever comes to the party will receive a present.

　　参加聚会的每一个人都将收到一份礼物.

　　When they will start has not been decided yet.

　　他们何时出发还没决定.

　　注意:上述例句中的主语从句都是放在句首,但有时为了使句子结构平衡,避免"头重脚轻",常用it作形式主语,而把从句放在后面. 例如:

　　It is a pity that she has made such a mistake.

　　她犯了这样一个错误,真是遗憾.

　　It depends on the climate whether they are going shopping today.

　　他们是否今天去购物还得看天气情况.

　　这样就构成了下面一些常用句型:

　　1)It is + adj. / n. +从句

　　It is a pity/shame that...遗憾的是……

　　It is possible that...很可能……