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1、Unit 2Great People,冀教版,单元同步语法精讲精练,before，after，as引导的时间状语从句1before作连词，意为“在之前”，用在主从复合句中引导时间状语从句。(1)在从句中使用一般过去时态时，主句中使用过去完成时。Lily had written some letters before she went out shopping.莉莉在出去购物前写了几封信。before本身就能明确地表示时间的先后关系，故多数主从句均使用一般过去时，而无需使用过去完成时。Many people left for home before the film ended. 电影尚未放完，
2、许多人就起身回家了。,(2)在主句中使用一般将来时态时，从句中使用一般现在时表示将来。I will finish my homework before you come back. 你回来之前，我会把作业写完。2after作连词使用时，意为“在之后”，和连词before互为反义词。(1)after用作连词引导状语从句，通常用一般现在时表示将来的含义。Shell telephone me after she arrives.她到达后将打电话给我。(2)after多用于过去时态的主从复合句中，从句含有“过去发生”的意思。After he sat in the classroom, he began
3、 to read books.他在教室里坐下后就开始读书。我们也常用 “after动词ing” 结构代替时间状语从句的功能，但主句和从句主语须一致。He wrote his first book after visiting Mongolia.他参观完蒙古后，写了他的第一本书。,3as引导时间状语从句，意思是“当的时候”，通常从句使用进行时态，此时同when/while；表达 “随着”的意思时，从句的动作须能表示持续。I saw him as he was getting off the bus.当他正下车的时候，我看见了他。He often listens to the music as h
4、e is doing his homework.他常常边听音乐边做作业。As time goes by, his illness is getting worse.随着时间流逝，他的病情也渐渐恶化。,跟在名词或代词后起修饰限定作用的句子，叫作定语从句。被修饰的词叫先行词，引导定语从句的词叫作关系词。定语从句不同于单词作定语的情况，它通常只能放在先行词之后。1who在从句中可作主语或宾语，指代的先行词为人，作宾语时通常可以省略。Is he the man who wants to see you？他就是想见你的人吗？,2that在从句中作主语或宾语，指代的先行词既可以是人，也可以是物，作宾语的时
5、候常可省略。Can you help me find the pen (that) my father sent me? 你能帮助我找到我爸爸送给我的那支钢笔吗？【注意】当先行词既有人又有物时，关系词只能用that。We know nothing about the doctors and the hospitals that you are talking about.关于你们正在谈论的医生和医院我们一无所知。,当先行词前有形容词最高级、序数词或only等词修饰的时候，关系词一般用that。This is one of the most interesting films that I ha
6、ve ever seen.这是我曾经看过的最有趣的电影之一。,一、单项选择。( )1.Its a good habit to wash your hands _ you have meals.Aunless Bwhile Cwhen Dbefore( )2.Stephen Hawking got more than 380，000 followers in two hours _ he put his first message on Weibo.Abefore Bsince Cafter Duntil,D,C,( )3.To make your DIY work perfect, youd
7、better not start _ you get all the tools ready.Awhen Bwhile Cbefore Dafter( )4.(2017广东)According to a survey, people _ are able to speak two languages can manage two things at the same time more easily.Awhich Bwhom Cwhose Dwho,C,D,( )5.(2017湖北十堰)This is a heartwarming story about a boy_ saved his mo
8、thers life.Awhich Bwho Cwhose Dwhom( )6.To be a better man is the best soap opera _ I have ever seen.Athat Bwhere Cwho Dwhom,B,A,二、按要求改写下列句子。7Linda felt sad. She failed the exam.(用after合并为一句)_.8Tina looked around and then she crossed the street.(用before改写句子)_.9I know the pilot.He comes from London.(合并为含有定语从句的复合句)_.,Linda felt sad after she failed the exam,Tina looked around before she crossed the street,I know the pilot who comes from London,