來(lái)源:網(wǎng)絡(luò)資源 作者:中考網(wǎng)整理 2020-01-16 16:26:33
[注意]下列情況只能用whether不能用if:①引導(dǎo)主語(yǔ)從句,②引導(dǎo)表語(yǔ)從句,③引導(dǎo)從句作介詞賓語(yǔ),④引導(dǎo)不定式短語(yǔ),⑤引導(dǎo)讓步狀語(yǔ)從句,⑥在動(dòng)詞discuss之后,⑦在wonder / not sure之后,⑧在if與whether含義易混時(shí)。如:Whether it is a fine day next Sunday is still a question.(下個(gè)星期天是不是個(gè)好天還是個(gè)問(wèn)題)(引導(dǎo)主語(yǔ)從句) / Please ask him whether to go there with a raincoat or not.(請(qǐng)問(wèn)一下帶不帶雨衣去那兒)(作動(dòng)詞的賓語(yǔ)) / Hainan is the place to be, whether it's summer or winter.(海南是個(gè)該去的地方無(wú)論冬夏)(引導(dǎo)讓步狀語(yǔ)從句)/ Please let me know whether you need my help.(請(qǐng)告訴我你是否需要我的幫助)(引導(dǎo)賓語(yǔ)從句)(如果換成if則還可能表示"如果你需要我的幫助請(qǐng)告知")
(3)while、when、as的用法區(qū)別:while常表示一個(gè)較長(zhǎng)的動(dòng)作,它引導(dǎo)的從句動(dòng)作與主句的動(dòng)作是同時(shí)發(fā)生的、是平行的;when可以表示較短的動(dòng)作也可以表示較長(zhǎng)的動(dòng)作,主句和從句的動(dòng)作可以同時(shí)發(fā)生也可以先后發(fā)生;as與上兩詞同義,可替換while和when, 表示主句和從句的動(dòng)作同時(shí)發(fā)生,常譯為"一邊……一邊……"。如:Please do not trouble me while I am writing my homework.(我寫(xiě)作業(yè)時(shí)請(qǐng)不要打擾我)/ I'll go home when I have finished my job.(我干完了活兒就回去)/ They were running quickly across the road when they heard the sound of a truck coming.(他們正快速地穿過(guò)馬路忽然聽(tīng)到了卡車開(kāi)來(lái)的聲音)/ As we walked in the dark street, we sang songs and talked loudly.(當(dāng)我們?cè)诤诙炊吹慕稚献呗窌r(shí)我們高聲地唱歌說(shuō)話)
(4)till/until與not…till/until的區(qū)別:前者表示一個(gè)延續(xù)性的動(dòng)作,后者表示一個(gè)才開(kāi)始的動(dòng)作。如:I will stay here and watch the baby until you return.(我會(huì)呆在這里看著娃娃直到你回來(lái))(stay這個(gè)動(dòng)作一直進(jìn)行到你return) / They won't go on working until they get what they think is reasonable.(他們要到獲得了他們認(rèn)為合理的東西時(shí)才會(huì)繼續(xù)干下去的)另外till與until基本可以互換,但是在句首時(shí)只能用until,不能用till. 如:Until the last minute of the match we kept playing.(我們堅(jiān)持到比賽的最后一分鐘)/ Not until he had finished his work did he go home.(直到做完工作他才回家)(倒裝句)
(5)though與although的區(qū)別:兩個(gè)詞都表示"雖然",均不可以與but同時(shí)使用,但在句中可加still或yet連用。although"盡管、雖然"僅作連詞,比較正式,一般可以換為though; though"雖然、盡管、即使",還可以與even連用(=even if),表示"即使、縱然",作副詞時(shí)意思是"然而、不過(guò)",不能放在句首。如:He passed the exams although illness prevented him from going to classes.(盡管疾病使他無(wú)法上課但是他還是通過(guò)了考試)/ she won't leave the TV set,even though her husband is waiting for her for the supper.(她不愿離開(kāi)電視機(jī)雖然丈夫在等她吃飯)/ It was a quiet party. I had a good time, though.(這是個(gè)不熱鬧的聚會(huì)盡管如此我還是玩得很開(kāi)心)
(6)prefer to…rather than…與prefer…to…的區(qū)別:prefer to…rather than…后面都是用動(dòng)詞原形,prefer…to…都是用動(dòng)名詞或名詞。如:I prefer English to Japanese.(與日語(yǔ)相比我更喜歡英語(yǔ))/ I prefer to learn English rather than learn Japanese. (與日語(yǔ)相比我更喜歡學(xué)英語(yǔ))
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