条件状语从句讲解(基础版本)(共6页).doc
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1、精选优质文档-倾情为你奉上条件状语从句讲解if引导的条件状语从句(注意&练习)在句子中做条件状语的从句称为条件状语从句。可置于句首、句尾,有时还可置于主语和谓语之间。引导条件状语从句的连接词有:if ,unless,as/so long as等 1.if引导的条件状语从句 表示在某种条件下某事很可能发生。 If we pay much attention to the earth, well have a better world. 如果我们多关爱地球,就会拥有一个更美好的世界 If it rains tomorrow, what shall we do? 如果明天下雨,我们怎么办? 注意:i
2、f还可以引导虚拟条件句,表示不可实现的条件,从句中多用一般过去时或过去完成时。What would happen if there were no water ?如果没有水会怎样?2.unless引导的条件状语从句unless的意思是如果不,除非。可与if.not互换。You will fail in English unless you work hard.你英语考试会不及格的,除非你更加努力。3.as /so long as引导的条件状语从句 as /so long as意思是“只要”So long as youre happy,i will be happy.只要你高兴,我就高兴。4.o
3、nce引导的条件状语从句once引导的条件状语从句,意为“一旦.,就”,从句可置于主句前或后Once you begin,never stop.一旦开始,就绝不要停止Maths is easy to learn once you understand the rules.一旦你理解了规则,数学就不难学了。提示:在条件状语从句中,用一般现在时代替一般将来时,用一般过去时代替过去将来时。If the weather is bad next week, well put off the climbing.如果下周天气不好,我们将推迟爬山。Father told me if I worked hard
4、 he would buy me a gift.爸爸告诉我,如果我努力学习,他会给我买一份礼物。注意 :学习 if 引导的条件状语从句的用法,现在总结一下: if 条件句不一般,几个要点记心间; 条件句,放在前,逗号要放句中间。 条件句表可能,主句多用将来时; 条件句表事实,主句常用现在时。在 if 引导的条件状语从句中,如果从句谈论的是一个有可能发生的事实及其产生的相关的结果,主句用一般将来时态,从句用一般现在时态。如: We can walk there if we cant find a bus . If it rains tomorrow ,we will not go to the
5、zoo. What will you do if you find a panda in danger.如果 if 条件句谈论的是重复发生和预示要发生的情景和事件,则主从句大多用一般现在时态。如: If bears are in danger ,they attack people.在 if 引导的条件状语从句中,if 和条件句位置灵活,可直接放在主句后面,若 if 条件句放句首, 从句后面要加逗号,和主句隔开。还要注意前后时态一致原则if 条件状语从句的时态练习 一在正确的答案下划一条线。1.Daina ( will go/go/goes) to Europe if she (will pa
6、ss/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/ isnt) rainy, we (will tak
7、e/ 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 beach if it (will rain/r
8、ain /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 live if they (will miss/ miss/ mi
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