一、主語(yǔ)從句的概念與類(lèi)型

　　主語(yǔ)從句在復(fù)合句中作主句的主語(yǔ),引導(dǎo)主語(yǔ)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(dāng)選了使我們很高興.

　　What caused the accident is a complete mystery.

　　是什么導(dǎo)致了這次事故還完全是一個(gè)謎.

　　Whether she will come or not is still a question.

　　她是否來(lái)還是一個(gè)問(wèn)題.

　　Which team will win the match is still unknown.

　　哪個(gè)隊(duì)會(huì)贏得這場(chǎng)比賽還不知道.

　　Whoever comes to the party will receive a present.

　　參加聚會(huì)的每一個(gè)人都將收到一份禮物.

　　When they will start has not been decided yet.

　　他們何時(shí)出發(fā)還沒(méi)決定.

　　注意:上述例句中的主語(yǔ)從句都是放在句首,但有時(shí)為了使句子結(jié)構(gòu)平衡,避免"頭重腳輕",常用it作形式主語(yǔ),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(gè)錯(cuò)誤,真是遺憾.

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

　　他們是否今天去購(gòu)物還得看天氣情況.

　　這樣就構(gòu)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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