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二、主語(yǔ)從句
1. 定義：用作主語(yǔ)的從句叫做主語(yǔ)從句。
2. 構(gòu)成：關(guān)聯(lián)詞+簡(jiǎn)單句
3. 引導(dǎo)主語(yǔ)從句的關(guān)聯(lián)詞有三類(lèi)：
(1) 從屬連詞that。 如：That they were in truth sisters was clear from the facial resemblance between them.
很明顯，她們確是親姐妹，她們的臉型很相似。
(2) 從屬連詞whether。如：
Whether he’ll come here isn’t clear. 他是否會(huì)來(lái)這里還不清楚。
(3) 連接代詞who, whom, whose, what, which, whoever, whatever, whichever
連接副詞 where, when, how, why。如：
What she did is not yet known. 她干了什么尚不清楚。
How this happened is not clear to anyone. 這事怎樣發(fā)生的，誰(shuí)也不清楚。
Whoever comes is welcome. 不論誰(shuí)來(lái)都?xì)g迎。
Wherever you are is my home ---- my only home. 你所在的任何地方就是我的家----我唯一的家。
解釋：
1. 主語(yǔ)從句能用it作形式上的主語(yǔ)。常以it作形式主語(yǔ)的句型有：
A. It+be+形容詞(obvious, true, natural, surprising, good, wonderful, funny, possible, likely, certain, probable, etc.)+that從句。如：
It is certain that she will do well in her exam. 毫無(wú)疑問(wèn)她考試成績(jī)會(huì)很好。
It is probable that he told her everything. 很可能他把一切都告訴她了。
B. It+be+名詞詞組(no wonder, an honour, a good thing, a pity, no surprise, etc.)+that從句。如：
It’s a pity that we can’t go. 很遺憾我們不能去。
It’s no surprise that our team should have won the game. 我們沒(méi)贏這場(chǎng)比賽真意外。
C. It+be+過(guò)去分詞(said, reported, thought, expected, decided, announced, arranged, etc.)+that從句。如：
It is said that Mr. Green has arrived in Beijing. 據(jù)說(shuō)格林先生已經(jīng)到了北京。
It is reported that China has sent another man-made earth satellite into orbit.
據(jù)報(bào)道中國(guó)又成功地發(fā)射了一顆人造地球衛(wèi)星。
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