来源:新浪博客 作者:中考网整合 2015-12-18 14:57:59
状语从句是用来修饰主句中的动词,副词和形容词的从句。根据其含义状语从句可分为时间状语从句,地点状语从句,条件状语从句,原因状语从句,结果状语从句,比较状语从句,目的状语从句,让步状语从句。
1.时间状语从句
(1)时间状语从句常用when,as,while,before,after,since,till,until,assoonas等连词来引导。例如:
Itwasraininghardwhengottoschoolyesterday.
Whilehewasdoinghishomework,thetelephonerang.
Ashewalkedalongthelake,hesanghappily.
HehadlearnedalittleChinesebeforehecametoChina.
Afterhefinishedmiddleschool,hewenttoworkinafactory.
(2)在时间状语从句里,通常不用将来时态,用现在时态表示将来的动作或状态。例如:
I’llringyouupassoonasIgettoNewYork.
Iwilltellhimeverythingwhenhecomesback.
Hewon’tbelieveituntilheseesitwithhisowneyes.
(3)在带有till或until引导的时间状语从句的主从复合句里,如果主句用肯定式,其含义是“一直到……时”,谓语动词只能用延续性动词。如果主句用否定式,其含义是“直到……才……”,“在……以前不……”,谓语动词可用瞬间动词。例如:
Theyoungmanreadtillthelightwentout.
Let’swaituntiltherainstops.
Wewon’tstartuntilBobcomes.
Don’tgetoffuntilthebusstops.
2.条件状语从句
(1)条件状语从句通常由if,unless引导。例如:
Whatshallwedoifitsnowstomorrow?
Don’tleavethebuildingunlessItellyouto.
(2)在条件状语从句里,谓语动词通常用现在时态表示将来的动作或状态。例如:
I’llhelpyouwithyourEnglishifamfreetomorrow.
Hewon’tbelateunlessheisill.
(3)“祈使句and(or)陈述句”在意思上相当于一个带有条件状语从句的复合句。例如:
Hurryup,oryou’llbelate.
=Ifyoudon’thurryup,you’llbelate.
Studyhardandyouwillpasstheexam.
=Ifyoustudyhard,youwillpasstheexam.
3.原因状语从句
(1)原因状语从句通常由because,since,as引导。例如:
Hedidn’tcometoschoolbecausehewasill.
Asitisraining,weshallnotgothezoo.
Sinceyoucan’tanswerthequestion,I’llasksomeoneelse.
(2)because表示直接原因,语气最强。Because引导的原因状语从句多放在主句之后。回答由why提出的问题,只能用because。As和since语气较弱,一般用来表示明显的原因。由as和since引导的原因状语从居多放在句首。例如:
------Whyaren’tgoingthere?
------BecauseIdon’twantto.
Ashehasnocar,hecan’tgetthereeasily.
Sincewehavenomoney,wecan’tbuyit.
(3)because和so不能同用在一个句子里。
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