1、举例：Jim joined the army in 1989.Jim joined the army when he was 20.He picked up some French words in Paris.He picked up some French words when he was in Paris.I will help you if you ask me.He wears a T-shirt though it is cold.必须符合“从句的三个必须”必须是句子；必须有连接词；必须是陈述句语法导学状语从句1、时间状语从句2、地点状语从句3、原因状语从句4、目的状语从句5、结
2、果状语从句6、条件状语从句7、让步状语从句状语从句【精讲】语法导学状语从句【时间状语从句】1.时间状语从句：1）由when引导。when指的是“某一具体的时间”。如：When I came into the room,he was writing a letter.We shall go there when we are free.语法导学状语从句【时间状语从句】1.时间状语从句：2）由while、as 引导。while指“在某一段时间里”，“在期间”，while引导的动作必须是持续性的。as引导持续性动作，强调主句和从句的动作同时发生，从句常译作“一边一边”。如：While it was
3、raining,they went out.He hurried home,looking behind as he went.语法导学状语从句【时间状语从句】1.时间状语从句：3）由before、after 引导。before表示在之前。after译为“在之后”。如：Be a pupil before you become a teacher.He arrived after the game started.语法导学状语从句【时间状语从句】1.时间状语从句：4）由till、until 引导。till 表示主句动词是持续性动作，常用肯定式，表示“直到为止”。亦可用until替换。Until
4、表示主句动词是瞬间动词，常用否定式，表示“直到才”“在以前不”,从句放在句首表示强调。如：We waited till(until)he came back.She didnt stop working until eleven oclock.语法导学状语从句【时间状语从句】1.时间状语从句：5）由since,as soon as 引导。状语从句在主句之前时一般用逗号与主句分开，如从句在主句之后则不必用标点符号。如：Great changes have taken place in China since 1978.I will send you a postcard as soon as I
5、 get there语法导学状语从句【地点状语从句】2.地点状语从句：由where引导。如：Where there is a will,there is a way.There are plenty of sheep where I live.语法导学状语从句【原因状语从句】3.原因状语从句：1）由because引导。because用来回答why 的问题，语气最强，一般放在主句之后。如：I came back late yesterday because I was on duty.语法导学状语从句【原因状语从句】3.原因状语从句：2）由since，as引导。Since，as都表示明显的或众做
6、周知的理由，多放句首。As语气比较弱，只是稍微提一下原因状语从句常放在句首,说明原因,主句说明结果,常用于口语中。如：Since everyone is here,lets begin our meeting.As I didnt know how to do it,I asked the teacher.语法导学状语从句【目的状语从句】4.目的状语从句：由so that,in order that引导。目的状语从句中常用情态动词may(might),can(could),should 等放在动词之前，从句往往放在主句之后,主从句之间不用任何标点符号。如：I shall write down
7、your telephone number so that I may not forget it.We worked harder in order that the task might be finished in a week.语法导学状语从句【结果状语从句】5.结果状语从句：1）由so that，sothat,so that前有逗号为结果状语从句。sothat的so后面跟形容词或副词。如：We turned up the radio,so that everyone heard the news.He was so excited that he couldnt say a word
8、.语法导学状语从句【结果状语从句】5.结果状语从句：2）由suchthat引导。suchthat的such后面跟名词，如果名词是单数就要用such a/anthat,还可以转换用sothat，语气较强。如：It is such an interesting novel that all of us want to read it.=It is so interesting a novel that all of us want to read it.语法导学状语从句【条件状语从句】6.条件状语从句：由if，unless，as/so long as引导。unless从句的谓语只能用肯定式。unl
9、ess和ifnot同义，unless是书面语，ifnot是口语，通常二者可以换用。If引导的条件状语从句的时态：主将从现如：We shall go there tomorrow unless it rains.=We shall go there tomorrow if it doesnt rain.As long as we study hard,we are certain to pass the exam.语法导学状语从句【让步状语从句】8.让步状语从句：1）由though，although引导。在句子中一般用了“虽然”就不能再用“但是”（but），但可以与yet或still连用。tho
10、ugh/although意义相同，用法基本一样，前者通俗，口语化，后者正式，多放主句的前面。如：Although(Though)he was over sixty,(yet)he began to learn French.语法导学状语从句【让步状语从句】8.让步状语从句：2）由even if，even though引导。even if 和even though的意思为“即使”“纵使”有退一步设想的意味,多用于书面语中。如：Ill go even if(though)it rains tomorrow.语法导学状语从句【让步状语从句】8.让步状语从句：3）由as引导。as引出的状语从句多用于书
11、面语，它比用though或although引导的从句语气强，更有表现力，从句常放在句首，语序部分倒装。如：Child as he is,he knows a lot.=Though/Although he is a child,he knows a lot.Old as he is,he studies English every day.=Though/Although he is old,he studies English every day.(1)Allow children the space to voice their opinions,_they are different from your own.（）A.until B.even if C.unless D.as thoughB语法导学状语从句【精练】解析 应该允许孩子们发表自己的看法，即使这些看法会与你的不同。even if引导一个让步状语从句,意思是“即使”，相当于even though。
