条件状语从句

1、条件状语从句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:i ,unless,aso long 等 i引导的条件状语从句 表示在某种条件下某事很可能发生。 f we pa mhattenionto the rth,l hve a bter wrd. 如果我们多关爱地球,就会拥有一个更美好的世界 ifiain tomoro, wat shal e do? 如果明天下雨,我们怎么办？ 注意：i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。wa oul hpen ifthere wo wte ？如果没

2、有水会怎样？2.unles引导的条件状语从句unless的意思是如果不，除非。可与if.t互换。yo il fail in eninless yo orkhard.你英语考试会不及格的,除非你更加努力。a o lnga引导的条件状语从句as/s logas意思是“只要”o lg as urep,i ill e appy.只要你高兴，我就高兴。4.once引导的条件状语从句nce引导的条件状语从句，意为“一旦.，就”，从句可置于主句前或后onc you gin,ver sop.一旦开始，就绝不要停止maths is eas t lear oncyou understand the ues.一旦你

3、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 weher baext week,welput ohe climig.如果下周天气不好，我们将推迟爬山。fthertold eif i orehard e woud by me a gift.爸爸告诉我,如果我努力学习,他会给我买一份礼物。 te weathr isbad ne week, wl ut ff th limbin.i.选择最佳答案.( ).if it _ sunny mrow,i _ atng a go b. wilbe, o c. s, ill willb, wil

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5、，我和你一起参观长城。_ 如果我们骑自行车去上班,我们可以避免空气污染。_8如果明天他不来,我会代替他去的。_9. dontkno wheathr he _(come) tomorowif he_( com),illtllo.0 we will go to the pak ulessit _ ( rain )11if _nhf an our,we _wait forh.ont ，nt ont oe，ont.snt come ,ontd.wil ome，don12如果他考试不及格，他的母亲会难过的hismoe_ _ if he _ assthe eam.1如果他明天起床不够早的话,就不能赶上早班

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