十四節(jié)課串講四六級(jí)語法第五講條件目的狀語從句ppt課件

1、十四節(jié)課串講四六級(jí)語法十四節(jié)課串講四六級(jí)語法第第5講條件、目的狀語從句講條件、目的狀語從句豌豆群：豌豆群：群：群：66437760一、條件狀語從句定義：由引導(dǎo)詞if或unless引導(dǎo)的狀語從句叫做條件狀語從句。在英文中，條件是指某一件事情實(shí)現(xiàn)之后狀語從句中的動(dòng)作，其它事情主句中的動(dòng)作才干發(fā)生，通常譯作“假設(shè)。留意：在含有條件狀語從句的復(fù)合句中，表示未來時(shí)態(tài)，主句是普通未來時(shí)態(tài)，從句要用普通如今時(shí),祈使句或情態(tài)動(dòng)詞主將從現(xiàn)原那么主將從現(xiàn)，將并非指未來時(shí)，還只表示未來含義的，跟著if后的那句話是從句。二、條件狀語從句用法語法引導(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

2、下某事很能夠發(fā)生。如： 1 If you ask him , he will help you. 2 If you fail in the exam ，you will let him down. 另外，if從句還表示不可實(shí)現(xiàn)的條件或根本不能夠存在的條件，也就是一種虛擬的條件或假設(shè)，從句多用普經(jīng)過去時(shí)或過去完成時(shí)。如： If I were you , I would invite him to the party. I would have arrived much earlier if I had not been caught in the traffic.三、引導(dǎo)詞引導(dǎo)條件狀語從句的連詞

3、有：if假設(shè)，unless除非；假設(shè)不，as long as除非；只需，supposing假設(shè)，on condition that條件是，in case假設(shè)。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。下面就這些詞的用法以例句的方式進(jìn)展一下簡(jiǎn)單總結(jié)。 1、unless conj.除非，假設(shè)不，除非在的時(shí)候 You will fail to arrive there in time unless you start earlier. Unless it rains , the game will be played.2、on condition(that).在條件下

4、，假設(shè) on condition (that).引導(dǎo)的條件從句是主句事件發(fā)生的前提條件或獨(dú)一條件。 I can tell you the truth on condition that you promise to keep a secret. You can go swimming on condition (that) you dont go too far from the river bank.3、supposing conj.假設(shè)，假設(shè) supposing引導(dǎo)的條件從句表示一種假設(shè)條件。 Supposing it rains, shall we continue the sports

5、 meeting? Supposing anything should go wrong , what would you do then? 4、provided conj.假設(shè)，除非，以假設(shè)，除非，以為條件為條件 provided (that) +從句表示一種假設(shè)條件。從句表示一種假設(shè)條件。 He will sign the contract provided we offer more favorable terms.He wont be against us in the meeting provided that we ask for his advice in advance. 從上

6、述例句可以看出從上述例句可以看出if, unless, on condition (that), supposing, provided等詞引導(dǎo)的條件狀語從句，主從句條件關(guān)等詞引導(dǎo)的條件狀語從句，主從句條件關(guān)系清楚，構(gòu)造明晰。系清楚，構(gòu)造明晰。 但有些句子，雖沒有含條件關(guān)系的連詞，卻也隱含著條件關(guān)但有些句子，雖沒有含條件關(guān)系的連詞，卻也隱含著條件關(guān)系，這些句子常用一些詞，如系，這些句子常用一些詞，如but for , without等引出一個(gè)介詞等引出一個(gè)介詞構(gòu)造來表示條件，條件經(jīng)常是虛擬的，或與現(xiàn)實(shí)相反的假設(shè)。構(gòu)造來表示條件，條件經(jīng)常是虛擬的，或與現(xiàn)實(shí)相反的假設(shè)。 如：but for假設(shè)非，

7、要不是 But for the rain, we should have a pleasant journey. But for your help, we should not have finished in time.You must speak louder so that /in order that you can be heard by all. He wrote the name down for fear that(lest) he should forget it. Better take more clothes in case the weather is cold.

8、專題二、目的狀語從句專題二、目的狀語從句一、目的狀語從句定義目的狀語從句：從句部分是用以補(bǔ)充闡明主句中謂語動(dòng)詞發(fā)生的目的的。 引導(dǎo)目的狀語從句常用的連詞有： that以便，so that以便， in order that為了；以便，Lest免得；唯恐， for fear that生怕；以免。 目的狀語從句的謂語常含有may, might, can, could, should, wouldYou must speak louder so that /in order that you can be heard by all. He wrote the name down for fear th

9、at(lest) he should forget it. Better take more clothes in case the weather is cold. 學(xué)習(xí)目的狀語從句應(yīng)留意以下兩點(diǎn)： 1目的狀語從句中常含有can , could, may, might, should等情態(tài)動(dòng)詞。 I got up early so that I could catch the first bus. 2在口語中so可以引導(dǎo)目的狀語從句。 Well sit nearer the front so we can hear better. 【留意】in order that與in order to的

10、區(qū)別： in order that+從句 in order to+動(dòng)詞原形 in order to后面加的那個(gè)不叫目的狀語從句，叫目的狀語 練習(xí)題練習(xí)題1.(07全國(guó)26)I wont call you，_ something unexpected happens.A. unless B. whether C. because D. while2.(07湖南33)Most brids find it safe to sleep in the trees，but _ they have eggs or young chicks，they dont use a nest.A. why B. how

11、 C. unless D. where3 My parents live in a small village. They always keep candles in the house _ there is a power out.A .if B. unless C in case D. so that4 In time of serious accidents，_ we know some basic things about first aid，we can save lives.A. whether B. until C. if D. unless5.(05北京33)Id like to arrive 20 minutes early _ I can have time for a cup of tea.A. as soon as B. as a result C. in case D. so that6.(08山東31) Youd be