條件狀語(yǔ)從句講解基礎(chǔ)本

1、條件狀語(yǔ)從句講解if引導(dǎo)的條件狀語(yǔ)從句（注意&練習(xí)）在句子中做條件狀語(yǔ)的從句稱(chēng)為條件狀語(yǔ)從句?？芍糜诰涫?、句尾，有時(shí)還可置于主語(yǔ)和謂語(yǔ)之間。引導(dǎo)條件狀語(yǔ)從句的連接詞有：if ,unless,as/so long as等 1.if引導(dǎo)的條件狀語(yǔ)從句 表示在某種條件下某事很可能發(fā)生。 If we pay much attention to the earth, we'll have a better world. 如果我們多關(guān)愛(ài)地球，就會(huì)擁有一個(gè)更美好的世界 If it rains tomorrow, what shall we do? 如果明天下雨，我們?cè)趺崔k？ 注意：if還可以

2、引導(dǎo)虛擬條件句，表示不可實(shí)現(xiàn)的條件，從句中多用一般過(guò)去時(shí)或過(guò)去完成時(shí)。What would happen if there were no water ?如果沒(méi)有水會(huì)怎樣？2.unless引導(dǎo)的條件狀語(yǔ)從句unless的意思是如果不，除非?？膳cif.not互換。You will fail in English unless you work hard.你英語(yǔ)考試會(huì)不及格的，除非你更加努力。3.as /so long as引導(dǎo)的條件狀語(yǔ)從句 as /so long as意思是“只要”So long as you're happy,i will be happy.只要你高興，我就高興。4.

3、once引導(dǎo)的條件狀語(yǔ)從句once引導(dǎo)的條件狀語(yǔ)從句，意為“一旦.，就”，從句可置于主句前或后Once you begin,never stop.一旦開(kāi)始，就絕不要停止Maths is easy to learn once you understand the rules.一旦你理解了規(guī)則，數(shù)學(xué)就不難學(xué)了。提示：在條件狀語(yǔ)從句中，用一般現(xiàn)在時(shí)代替一般將來(lái)時(shí)，用一般過(guò)去時(shí)代替過(guò)去將來(lái)時(shí)。If the weather is bad next week, we'll put off the climbing.如果下周天氣不好，我們將推遲爬山。Father told me if I worke

4、d hard he would buy me a gift.爸爸告訴我，如果我努力學(xué)習(xí)，他會(huì)給我買(mǎi)一份禮物。注意 ：學(xué)習(xí)" if " 引導(dǎo)的條件狀語(yǔ)從句的用法,現(xiàn)在總結(jié)一下: if 條件句不一般,幾個(gè)要點(diǎn)記心間; 條件句,放在前,逗號(hào)要放句中間。 條件句表可能，主句多用將來(lái)時(shí)； 條件句表事實(shí)，主句常用現(xiàn)在時(shí)。在 if 引導(dǎo)的條件狀語(yǔ)從句中，如果從句談?wù)摰氖且粋€(gè)有可能發(fā)生的事實(shí)及其產(chǎn)生的相關(guān)的結(jié)果，主句用一般將來(lái)時(shí)態(tài)，從句用一般現(xiàn)在時(shí)態(tài)。如： We can walk there if we can't find a bus . If it rains tomorrow

5、 ,we will not go to the zoo. What will you do if you find a panda in danger.如果 if 條件句談?wù)摰氖侵貜?fù)發(fā)生和預(yù)示要發(fā)生的情景和事件，則主從句大多用一般現(xiàn)在時(shí)態(tài)。如： If bears are in danger ,they attack people.在 if 引導(dǎo)的條件狀語(yǔ)從句中，if 和條件句位置靈活，可直接放在主句后面，若 if 條件句放句首， 從句后面要加逗號(hào)，和主句隔開(kāi)。還要注意前后時(shí)態(tài)一致原則if 條件狀語(yǔ)從句的時(shí)態(tài)練習(xí) 一在正確的答案下劃一條線(xiàn)。1.Daina ( will go/go/goes) t

6、o Europe if she (will pass/pass/passes) the exams .2. The graduates (will teach/teach/teaches) in the poor village if the Ministry of Education (will agree/ agree/agrees) soon.3. If there (will be/ are/is) a car accident, they (will call/call/calls) 110 for help at once.4. If it (wont/dont/doesnt/ i

7、snt) rainy, we (will take/ take/takes) walk outside.5. If a UFO (will land/land/lands) in front of me, I (will go/go/goes) in to look for the alien.6. If he (will have/have/has) money, he (will bulid/build/builds) a science lab.7.Dont wait for me if I (am/ will be) late.8.They (wont/dont) go to the

8、beach if it (will rain/rain /rains).9. I (will call/ call) you if he (will stay/stay /stays) at home.10. Mr Smith (will let/ let/lets) you know if he (will need/ need/ needs) help.11. (Will / Do/ Does) he visit the museum if he (wont / dont/ doesnt) get  tired?12. Where (will/ do/does) they liv

9、e if they (will miss/ miss/ misses) the bus?狀語(yǔ)：狀語(yǔ)是句子的重要修飾成分。狀語(yǔ)是謂語(yǔ)里的另一個(gè)附加成分,它附加在謂語(yǔ)中心語(yǔ)的前面,從情況,時(shí)間,處所,方式,條件,對(duì)象,肯定,否定,范圍和程度等方面對(duì)謂語(yǔ)中心進(jìn)行修飾或限制。用來(lái)說(shuō)明地點(diǎn)、時(shí)間、原因、目的、結(jié)果、條件、方向、程度、方式和伴隨狀況等。狀語(yǔ)一般由副詞、介詞短語(yǔ)、分詞和分詞短語(yǔ)、不定式或相當(dāng)于副詞的詞或短語(yǔ)來(lái)?yè)?dān)當(dāng)。其位置一般放在句末，但也可放在句首或句中。副詞是一種用來(lái)修飾動(dòng)詞,形容詞,副詞或全句的詞,說(shuō)明時(shí)間,地點(diǎn),程度,方式等概念。1.副詞一般在句子中做狀語(yǔ)He speaks Engli

10、sh very well. 他英語(yǔ)說(shuō)得非常好.中的very是程度副詞，用來(lái)修飾well。very well是修飾speak的程度狀語(yǔ)。He is playing under the tree.他在樹(shù)下玩兒.中的under the tree是地點(diǎn)狀語(yǔ).2. 不定式在句子中可以作目的狀語(yǔ)。I come specially to see you.我專(zhuān)門(mén)來(lái)看你.3.介詞短語(yǔ)Ten years ago, She began to live in Dalian.The boy was praised for his bravery.4.從句作狀語(yǔ)When she was 12 years old, she

11、 began to live in Dalian.If I am not busy tomorrow, I will play football with you.5.分詞作狀語(yǔ)Having had a quarrel with his wife, he left home in a bad temper。Inhibited in one direction, it now seems that the Mississippi is about to take another.在復(fù)合句中，由從句表示的狀語(yǔ)叫做條件狀語(yǔ)從句。它可以用來(lái)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

12、以分為時(shí)間狀語(yǔ)從句，原因狀語(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。定義由連接詞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(lái)時(shí)態(tài)，從句要用一般現(xiàn)在是主將從先原則)在英文中，條件是指某一件事情實(shí)現(xiàn)之后（狀語(yǔ)從句中的動(dòng)作），其它事情（主句中的動(dòng)作）才能發(fā)生，通常譯作“假如，如果，除非”。引導(dǎo)詞：常用引導(dǎo)詞： if , unless特殊引導(dǎo)詞: as long as（除非；只要），supposing（假設(shè)），on condition that（條件是），in case（如果）條件狀語(yǔ)從句的位置可放在句

13、首或句尾，放在句首時(shí)常用逗號(hào)與主句隔開(kāi)。If 引導(dǎo)詞用法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:1.真實(shí)條件句：表示在某種條件下某事很可能發(fā)生。如: If you ask him, he will help you.如果你請(qǐng)他幫忙,他會(huì)幫你的。 If you fail in the exam, you will let him down.如果你考試不及格,你會(huì)讓他失望的。If it rains tomorrow, we wont go on a picnic. 如果明天下雨，我們就不去野餐。注意：在含有條件狀語(yǔ)從句的復(fù)合句中，表示將來(lái)時(shí)態(tài)，主句是一般將來(lái)時(shí)態(tài)，從句要用一般現(xiàn)在時(shí)主將

14、從現(xiàn)原則，并且，切記緊跟著if的那句話(huà)是從句。） 2. 非真實(shí)條件句是虛擬語(yǔ)氣的一種，表示與事實(shí)相反 ，不可實(shí)現(xiàn)的條件或根本不可能存在的條件,也就是一種虛擬的條件或假設(shè),從句多用一般過(guò)去時(shí)或過(guò)去完成時(shí)。如: If I were you, I would invite him to the party.如果我是你,我會(huì)邀請(qǐng)他參加聚會(huì)。 I would have arrived much earlier if I had not been caught in the traffic. 如果沒(méi)有堵車(chē),我會(huì)到的早一點(diǎn)兒。 If I were you, I would go with him.如果我是你

15、,我會(huì)和他一起去的。unless引導(dǎo)詞用法固定搭配： unless = if.not 除非,若不,除非在的時(shí)候You will fail to arrive there in time unless you start earlier.If you dont start earlier, you will fail to arrive there in time.如果你不早點(diǎn)動(dòng)身,你就不能及時(shí)趕到那兒。 Unless it rains, the game will be played.If it dosen't rain，the game will be played.除非下雨,比賽將

16、照常進(jìn)行。 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. 經(jīng)典語(yǔ)句：If it dosen't rain tomorrow,we will go to the zoo.條件狀語(yǔ)從句就是用以表示“在某種條件下,會(huì)”由as (so) long as, in case引導(dǎo)。So long as youre happy, it doesnt matter what you do.只要你高興，你做什么都沒(méi)有關(guān)系。You may borrow my book as long as you keep it clean.只要你保持書(shū)的清潔，你就可以把我的書(shū)借去。Take your umbrella in case it rains.帶著你的傘吧，以防下雨。完成下列句子 1。如果你請(qǐng)求他，他會(huì)幫你的If you _him, he _ _you2。如果她早點(diǎn)兒起床，就有時(shí)間在家里吃早餐 If she_ _a little earlier, shell have time to eat breakfas