在復(fù)合句中,由從句表示的狀語(yǔ)叫做狀語(yǔ)從句。由連接詞if或unless引導(dǎo)的狀語(yǔ)從句叫做條件狀語(yǔ)從句。下面,就由小編來為大家簡(jiǎn)單介紹一下條件狀語(yǔ)從句。

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在復(fù)合句中,由從句表示的狀語(yǔ)叫做狀語(yǔ)從句。它可以用來修飾主語(yǔ)中的動(dòng)詞.形容詞.副詞等。根據(jù)它表達(dá)的意思,狀語(yǔ)從句可以分為時(shí)間狀語(yǔ)從句,地點(diǎn)狀語(yǔ)從句,條件狀語(yǔ)從句,比較狀語(yǔ)從句,目的狀語(yǔ)從句,結(jié)果狀語(yǔ)從句和讓步狀語(yǔ)從句等。由連接詞if或unless引導(dǎo)的狀語(yǔ)從句叫做條件狀語(yǔ)從句。(注意:在含有條件狀語(yǔ)從句的復(fù)合句中,如果主句是一般將來時(shí)態(tài),從句要用一般現(xiàn)在時(shí)[主將從現(xiàn)原則])

條件狀語(yǔ)從句的語(yǔ)法:

e.g. If you're not satisfied with the life you're living, don't just complain. Do something about it. 對(duì)于現(xiàn)況的不滿,不能只是抱怨,要有勇氣作出改變。

If you're lonely when you're alone, you're in bad company.--Jean Paul Sartre? 如果你獨(dú)處時(shí)感到寂寞,說明沒有把自己陪好。

條件狀語(yǔ)從句就是用以表示“在某種條件下,會(huì)……”

常用 if ,in case , on condition等詞來引導(dǎo)

連接詞主要有 if, unless, as/so long as, on condition that,provided,suppose,supposing 等。.

主句用一般將來時(shí),if或unless引導(dǎo)的條件狀語(yǔ)從句用一般現(xiàn)在時(shí)。

固定搭配:unless = if...not. 

e.g. Let's go out for a walk unless you are too tired.

If you are not too tired, let's go out for a walk.

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if 引導(dǎo)的條件句有真實(shí)條件句和非真實(shí)條件句兩種:

真實(shí)條件句,敘述真實(shí)可能發(fā)生的事情,例如:

They get angry if they think they are being treated disrespectfully.? 他們要是覺得受到了怠慢,就會(huì)大動(dòng)肝火。

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非真實(shí)條件句是虛擬語(yǔ)氣的一種,表示與事實(shí)相反,例如:

If I were you, I would go with him. 如果我是你,我就跟他走。

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由as (so) long as, in case引導(dǎo)。

The president need not step down so long as the elections are held under international supervision.? 只要選舉在國(guó)際監(jiān)督下進(jìn)行,總統(tǒng)就不用下臺(tái)。

He paused enough to consider the options but never so long as to lose the initiative.? 他停頓了一會(huì)兒權(quán)衡自己有哪些選項(xiàng),但并沒有久到喪失主動(dòng)權(quán)。

She had had the foresight to prepare herself financially in case of an accident.? 她有先見之明,經(jīng)濟(jì)上作了準(zhǔn)備以防萬一發(fā)生事故。

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