一、主語從句的概念與類型

　　主語從句在復合句中作主句的主語,引導主語從句的詞有從屬連詞that, whether以及連接代詞who, what, which, whoever, whatever, whichever和連接副詞when, where, why, how等. 例如:

　　That she was chosen made us very happy.

　　她當選了使我們很高興.

　　What caused the accident is a complete mystery.

　　是什么導致了這次事故還完全是一個謎.

　　Whether she will come or not is still a question.

　　她是否來還是一個問題.

　　Which team will win the match is still unknown.

　　哪個隊會贏得這場比賽還不知道.

　　Whoever comes to the party will receive a present.

　　參加聚會的每一個人都將收到一份禮物.

　　When they will start has not been decided yet.

　　他們何時出發還沒決定.

　　注意:上述例句中的主語從句都是放在句首,但有時為了使句子結構平衡,避免"頭重腳輕",常用it作形式主語,而把從句放在后面. 例如:

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

　　她犯了這樣一個錯誤,真是遺憾.

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

　　他們是否今天去購物還得看天氣情況.

　　這樣就構成了下面一些常用句型:

　　1)It is + adj. / n. +從句

　　It is a pity/shame that...遺憾的是……

　　It is possible that...很可能……

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