由 if 和unless 引導(dǎo)的條件狀語從句

1、由 if 和 unless 引導(dǎo)的條件狀語從句1. if we lose our short-term memory, we forget things happening recently.譯：_2. if the picture is silly, strange and colorful, you will remember it better.譯：_a: if sentences: actions with definite results. 有必然結(jié)果發(fā)生的行動eg: if you go into a clothes shop, you find clothes.2 if you g

2、o into a car showroom, you see cars.3 water turns into ice if you cool it.4 the wood floats if you put it into water.conclusion:1). 如果 if 條件句談?wù)摰氖侵貜?fù)發(fā)生和預(yù)示必定要發(fā)生的情景和事件，則主 從句大多用一般現(xiàn)在時態(tài)。2). 在 if 條件句中，if 條件從句可以放在前面，也可以放在后面。當(dāng) if 引 導(dǎo)的條件從句放在前面時，后面常用逗號隔開。b: if sentences: actions with possible results. 有可能性結(jié)果發(fā)生的

3、行動eg: if you ask him，he will help you 如果你請他幫忙，他會幫你的。 if you fail in the exam，you will let him down在 if 引導(dǎo)的條件狀語從句中 ,如果從句談?wù)摰氖且粋€有可能發(fā)生的事實及 其產(chǎn)生的相關(guān)的結(jié)果，主句用一般將來時態(tài)，從句用一般現(xiàn)在時態(tài)。c: unless 引導(dǎo)的條件狀語從句：unless= if not. conj. 除非 , 若不, 除非（否 則）e.g.: lets go out for a walk unless you are too tired.= if you are not too ti

4、ed, lets go out for a walk. 我們出去散步吧，除非是你太累。 譯：如果你不早點出發(fā),你就不能及時趕到那兒。我們可以把 unless 或 ifnot 從句放在句子開頭或末尾。you will be late for school unless you leave now. =unless you leave now, you will be late for school.除非你早點出發(fā)，（否則）你上學(xué)會遲到。you will be late for school if you dont leave now. =if you dont leave now, you wi

5、ll be late for school. 如果你不早點出發(fā)，你上學(xué)遲 到?！癷f 引”導(dǎo)的條件狀語從句的用法,現(xiàn)在總結(jié)一下 :1)引導(dǎo)條件狀語從句最常用的連詞是 if。 if 引導(dǎo)的條件句有真實條件句和非真 實條件句兩種（非真實條件句會在以后的虛擬語氣中闡述），其引導(dǎo)的真實條件 狀語從句表示在某種條件下某事很可能發(fā)生。2）if 條件句不一般,幾個要點記心間; 條件句,放在前,逗號要放句中間。條件句表可能，主句多用將來時；條件句表事實，主句常用現(xiàn)在時?！眷柟叹毩?xí)】一if 和 unless 句型互改。eg: you will fail the exam if you dont work har

6、d.= you will fail the exam unless you work hard.1）unless you obey the rules, you will be punished.=_.2) a fish dies if you dont keep it in the water.=_ 3) no body can learn english well if he doesnt work hard on it.=_.4) unless you start right now, you will be late for the meeting.=_.二用 if 或 unless

7、填空。1. you put wood into water, it floats.2. i sleep with the window open it is really cold.3. you will not improve your skill in a short time _ you practice playing the violin regularly.4. ice melts you heat it.5. you boil water, it becomes steam （蒸汽）.6. you dont work hard, you will fail the exam.7.

8、 he cant be here on timehe gets up early.8. you dont have enough sleep, you will feel tired.9. it is fine tomorrow, i will go fishing with my dad.10. you finish your homework, you will not go out to play.三單項選擇。1. you will not remember the facts you understand them well.a. if b. unless c. if not d. b

9、ecause 2. shenzhen a dirty place if we the ground.a. is; litter b. will be; will litter c. is; are litteringd. will be; litter 3. if you harder, you will fail the exam.a. not work b. workc. dont work d. wont work4. you obey the rules, you will be punished.a. if b. since c. because d. unless5. he can

10、t see the words on the board unless hehis glasses.a. wear b. wearsc. doesnt wear d. to wear6. if you plant seeds in soil, .a. it grows b. they grow c. you grow d. it will grow 7. if you check your timetable every night, it _ in your mind better.a. will stay b. stay c. stayed d. staying 8. a tourist

11、will easily lose his way in beijing _ he has a map or guide.a. if b, because c. unless d. when 9. i shall telephone the police and complain about it _ _ the noise .a. if, stops b. unless, stops c. if not, stopsd. unless, stop10. i sleep with the window openits really cold.a. if b. if not c. unless11. _ you try, you will never succeed.a. if b. until c. since12. _ he doesnt come on time, we will go without him. a. if b. unless c. when12. i will come to see you if it _ rain tomorrow morning. a. wont b. didnt c. doesnt13. if you take a fish out of the water, i