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l fail to arrive there in time unless you start ,你就不能及時(shí)趕到那兒。這些詞由于出現(xiàn)的頻率較小,且用法較復(fù)雜一些,所以不如if為大家所熟知罷了。I will buy a DVD set if necessary.必要的話,我就買一臺(tái)DVD。 (, D對(duì)) (3)條件狀語從句中的省略。如: If the policeman had arrived earlier, he would have seen the accident. 要是警察更早些到達(dá),他就能見到事故了。t be able to see her friends very often. A) has to get B) were to get C) had got D) could have got 吉不想立刻工作,因?yàn)樗耄喝绻玫揭环莨ぷ?,她就不能?jīng)常去看她的朋友了。 Jean doesn39。(, 答案是D)。(1)表示與現(xiàn)在的情況相反,或?qū)韺?shí)現(xiàn)的可能性很小,if從句用過去式(動(dòng)詞be多用were這個(gè)形式),主句用“would/should/could/might+動(dòng)詞原形”。(2)注意條件狀語從句在虛擬語氣中的使用?!纠縄 will e to see you if I have time.我有時(shí)間,我就來看你。s go out for a walk. 如果你不太累讓我們出去。s go out for a walk unless you are too tired. 如果你不累的話讓我們出去走走?! f you fail in the exam, you will let him ,你會(huì)讓他失望的。條件狀語從句我們知道,引導(dǎo)條件狀語從句最常用的連詞是if, 由if引導(dǎo)的條件狀語從句表示在某種條件下某事很可能發(fā)生。如: If you ask him, he will help ,他會(huì)幫你的。unless = if not. Let39?!?If you are not too tied, let39。學(xué)習(xí)條件狀語從句應(yīng)注意以下幾點(diǎn):(1)條件狀語從句中一般不使用將來時(shí)態(tài),盡管主句使用將來時(shí)態(tài),而主句用一般現(xiàn)在時(shí)或現(xiàn)在完成時(shí)。If the rain stops, I shall go out for a walk.如果雨停了,我就出去散步。【例】If I were to I should first of all get the experts to discuss the plan.如果我真的想做這事,我首先會(huì)找專家們討論我的計(jì)劃。例如: If places_______alike, there would be little need for geographers. A. being B. are C. be D. were 如果各地方都一樣,就不需要地理學(xué)家了。 在表示將來情況的虛擬條件句中,還可以用“were+to 不定式”或“should+動(dòng)詞原形”。t want to work right away because she thinks that if she ____ a job, she probably wouldn39。(, B對(duì)) ( 2) 表示與過去的事實(shí)相反,從句用過去完成時(shí),主句用“would/should/coul