狀語(yǔ)從句的省略是指使語(yǔ)言的精煉將狀語(yǔ)從句進(jìn)行簡(jiǎn)化。需滿足兩個(gè)條件: 1.主句和從句的主語(yǔ)一致，或從句主語(yǔ)為it；2. 從句主要?jiǎng)釉~是be的某種形式。

例如：

When ( the museum is ) completed , the museum will be open to the public next year .

He’ll go to the seaside for his holiday if (it is ) possible.

另外，比較狀語(yǔ)從句經(jīng)常省略。

例如：

The higher the temperature (is), the greater the pressure (is ).

狀語(yǔ)從句的"簡(jiǎn)化"現(xiàn)象常存在于以下五種狀語(yǔ)從句中:

①由if, unless等引導(dǎo)的條件狀語(yǔ)從句;

②由although, though, even if / though等引導(dǎo)的讓步狀語(yǔ)從句;

③由when, while, as, before, after, until / till等引導(dǎo)的時(shí)間狀語(yǔ)從句;

④由as, as if等引導(dǎo)的方式狀語(yǔ)從句;

⑤由as, than等引導(dǎo)的比較狀語(yǔ)從句。下面針對(duì)這五種情形作一歸納。

(1)當(dāng)狀語(yǔ)從句的主語(yǔ)是it,且謂語(yǔ)動(dòng)詞是be時(shí),it和be要完全簡(jiǎn)化掉。

例如:

If (it is) possible, he will help you out of the difficulty.
如果可能的話,他會(huì)幫你擺脫困境。

You must attend the meeting unless (it is) inconvenient to you.
除非情況對(duì)你來(lái)說(shuō)不方便,否則你必須出席這次會(huì)議。

(2)當(dāng)狀語(yǔ)從句的主語(yǔ)和主句的主語(yǔ)一致時(shí),從句可以將主語(yǔ)和be動(dòng)詞簡(jiǎn)化掉。常用于以下幾種情形:

a.連詞+形容詞

As (he was) young, he learned how to ride a bike.
他小時(shí)候就學(xué)會(huì)了騎自行車(chē)。

Work hard when (you are) young, or you'll regret
.
少壯不努力,老大徒傷悲。

b.連詞+名詞

Although (he was) a farmer, now he is a famous director.盡管他曾是個(gè)農(nóng)民,而現(xiàn)在是位著名的導(dǎo)演了。

c.連詞+現(xiàn)在分詞

Although (he is) doing his best in maths these days, he has still got no good marks.盡管近來(lái)他一直在學(xué)數(shù)學(xué),但他仍然沒(méi)有取得好成績(jī)。

d.連詞+過(guò)去分詞

He won't go there with us unless (he is) invited.
除非受到邀請(qǐng),否則他不會(huì)和我們一道去那里。

The concert was a great success than (it was) expected.
這場(chǎng)音樂(lè)會(huì)出乎意料地取得了巨大成功。

e.連詞+不定式

He stood up as if (he were) to say something.
當(dāng)時(shí)他站起來(lái)好像要說(shuō)什么。

He wouldn't solve the problem even if (he were) to take charge.
即使他來(lái)負(fù)責(zé),他也解決不了這個(gè)問(wèn)題。

f. 連詞+介詞短語(yǔ)

She looked anxious as though (she was) in trouble.
她看上去很焦急,好像遇到了麻煩。

He had mastered the English language before (he was) in the USA.
他到美國(guó)之前就懂英語(yǔ)了。

注意:當(dāng)從句主語(yǔ)和主句主語(yǔ)不一致時(shí),從句部分要么用完全形式,要么用獨(dú)立主格結(jié)構(gòu)來(lái)表達(dá)。例如:

When the meeting was over, all the people went out of the meeting-room.
當(dāng)會(huì)議結(jié)束時(shí),人們都走出了會(huì)議室。