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1、If真實(shí)條件句與虛擬條件句真實(shí)條件句與虛擬條件句1.真實(shí)條件句真實(shí)條件句是指主句中的某一動(dòng)作或狀態(tài)是在真實(shí)情況下或有可能實(shí)現(xiàn)的情形下發(fā)生的。在表示真實(shí)條件句的復(fù)合句中,表?xiàng)l件的狀語(yǔ)從句和表結(jié)果的主句的謂語(yǔ)都用陳述語(yǔ)氣。*Ifyoucomebacklate,yourmotherwillworryaboutyou.如果你回來(lái)晚了,你媽媽會(huì)擔(dān)心的。(if引導(dǎo)真實(shí)條件句,主句用一般將來(lái)時(shí),從句用一般現(xiàn)在時(shí)表將來(lái))*Ifyoursuggestionisrejected,theywillletyouknow.如果你的建議遭到拒絕,他們會(huì)讓你知道的。(if引導(dǎo)真實(shí)
2、條件句,主句用一般將來(lái)時(shí),從句用一般現(xiàn)在時(shí)表將來(lái))2.虛擬條件句(1)虛擬條件句指的是與事實(shí)相反或不太可能實(shí)現(xiàn)的事。在表示非真實(shí)條件的復(fù)合句中,表示條件的狀語(yǔ)從句和表示結(jié)果的主語(yǔ)的謂語(yǔ)動(dòng)詞要用虛擬語(yǔ)氣。從句主句與現(xiàn)在事實(shí)相反If+主語(yǔ)+動(dòng)詞過(guò)去式主語(yǔ)+should/would/could/might+動(dòng)詞原形與過(guò)去事實(shí)相反If+主語(yǔ)+haddone主語(yǔ)+should/would/could/might+havedone與將來(lái)事實(shí)相反①if+主語(yǔ)+動(dòng)詞過(guò)去式主語(yǔ)+should/would/could①if+主語(yǔ)+shoulddo②if+主語(yǔ)+weret
3、odo/might+動(dòng)詞原形*IfIwereyou,Iwouldfocusmyattentiononlookingaftermyelderlyparents.如果我是你,我會(huì)把注意力集中在照顧年邁的父母上。(if引導(dǎo)虛擬條件句,敘述與現(xiàn)在事實(shí)相反,主句謂語(yǔ)動(dòng)詞用woulddo,從句謂語(yǔ)動(dòng)詞用過(guò)去式,be用were)*Ifhehadgotupalittleearier,hewouldn’thavebeenlate.如果他早一點(diǎn)起床,他就不會(huì)遲到了。(if引導(dǎo)虛擬條件句,敘述與過(guò)去事實(shí)相反,主句用謂語(yǔ)動(dòng)詞wouldhavedone,從句謂語(yǔ)動(dòng)詞用hadd
4、one)*Ifheshouldcome(weretocome/came)tomorrow,Iwouldtreathimtodinner.如果他明天來(lái),我就請(qǐng)他吃飯。(if引導(dǎo)虛擬條件句,敘述與將來(lái)事實(shí)相反,主句謂語(yǔ)動(dòng)詞用woulddo,從句謂語(yǔ)動(dòng)詞有三種形式:shoulddo,weretodo,過(guò)去式)P當(dāng)條件狀語(yǔ)從句表示的動(dòng)作與主句表示的動(dòng)作發(fā)生的時(shí)間不一致時(shí),動(dòng)詞的形式要根據(jù)它所表示的時(shí)間來(lái)調(diào)整,這種虛擬條件句稱之為錯(cuò)綜復(fù)雜虛擬條件句。往往是主句敘述與現(xiàn)在事實(shí)相反,謂語(yǔ)動(dòng)詞用would/should/might/coulddo,而從句敘述與過(guò)去事
5、實(shí)相反,謂語(yǔ)動(dòng)詞用haddone.*IfIhadstudiedhard,Iwouldbesittingintheofficecomfortablynow.如果我早努力學(xué)習(xí),我現(xiàn)在就會(huì)舒舒服服地坐在辦公室里了。(從句敘述與過(guò)去事實(shí)相反,謂語(yǔ)動(dòng)詞用haddone,主句敘述與現(xiàn)在事實(shí)相反,謂語(yǔ)動(dòng)詞用would/should/could/mightdo)(2)if引導(dǎo)虛擬條件句的省略。If虛擬條件句中若含有were,should或者助動(dòng)詞had,則可以把這三個(gè)詞提前,省去if,出現(xiàn)省略倒裝形式。*IfIwereyou,Iwouldhelphim.--Were
6、Iyou,Iwouldhelphim.如果我是你,我會(huì)幫助他。(if虛擬條件句中含有were,則可以省去if,把were提前)*Ifhehadknowntheresult,hewouldn’thaveshoutedatmother.--Hadheknowntheresult,hewouldn’thaveshoutedathismother.如果他早知道這個(gè)結(jié)果,他就不會(huì)朝他媽媽大聲吼了。(if虛擬條件句中含有助動(dòng)詞had,則可以省去if,把had提前)*Ifanearthquakeshouldhappen,whatwouldyoudofirst?--
7、Shouldanearthquakehappen,whatwouldyoudofirst?萬(wàn)一發(fā)生地震,你要先怎么做?(if虛擬條件句中含有should,則可以省去if,把should提前)