九种状语从句详解以及专项练习.docx
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1、状语从句能力要求:了解状语从句的分类情况及各类状语从句中经常使用的连词;能够在真实的语境中断定从句与主句的逻辑关系,从而使用恰当的连词完成交际; 能够区分同类状语从句中近似连词的用法差异。一、时间状语从句when, while 和 asDwhen既可引导一个持续动作,也可引导一个短暂动作,可用于主句动作和从句动作同时 发生或从句动作先于主句动作:When I lived there, I used to go to the seashore on Sundays.When the film ended, the people went back.当when引出的时间状语从句为系表结构,而且其主
2、语和主句的主语一致,其表语又是一 个名词时,就可以那个以as引出的省略句,来代替when引导的从句:As a young man ( = when he was a young man ), he was fond of hunting.2) while引导的动作必须是持续性的,侧重主句动作和从句动作相比照:Please dont talk so loud while others are working.While I was wondering at this, our schoolmaster took his place.3) as引导一个持续动作,多用于主句动作和从句动作同时发生:H
3、e hurried home, looking behind as he went.John sings as he works.4) when还可用作并列连词,其意义为at this / that time,常用于以下句式:be doing sth. when . / be about to do sth. when . / had (just) sth. when .此外,when还可表示原因“既然It was foolish of you to take a taxi when you could easily walk there in five minutes.How can you
4、 hope for mercy yourself when you show none?5) while作为并列连词,意为“而,却”,表示比照:Mom was cooking in the kitchen while dad was watching TV in the sitting room.He likes pop music while I am fond of folk music.6)如果主句表示的是短暂动作,而从句用延续性动词的进行时态表示在一段时间内正在进 行的动作时,when、while和as可以互相换用:When / While / Asi was walking down
5、 the street, I came across an old friend of mine.while必须与延续性动词连用;强调主句动作延续到从句所指的整个时间时,只能用while; 表示“随着只能用as;表示有规律的“每当”时或主从句动作有先后时,只能用when.The plane had left when we got to the airport. ( 不用 while)As time passed, the event became more and more popular.(不用 while 或 when )When winter comes, it becomes col
6、d. (每当, 不用 as 或 while )When you have finished your work, you may have a rest.(不用 while 或 as )as soon as, immediately, directly, the moment, the minute, the second, once ( 一旦就) no sooner . than., hardly / scarcely . when .这些附属连词引导的从句都表示从句的动作一发生,主句的动作随即就发生,常译为“一 就从句中用一般时态代替将来时态:The moment I heard the
7、voice, I knew father was coming.The boy burst into tears immediately he saw his mother.Once you remember it, you will never forget it.No sooner had we arrived at the station than the train left.最后三个句式中,no sooner与hardly / scarcely引导的主句谓语动词要用过去完成时,而 than与when的从句中要用一般过去时,此外,当把no sooner与hardly / scarcel
8、y提到句首 时,应用倒装语序:I had hardly got home when it began to rain. = Hardly had I got home when it began to rain.On + v-ing ( hearing, seeing, returning 等)或 n.( arrival, return 等)也等于 as soon as.1. till, until 和 not . until1)肯定句:主句谓语动词必须是延续性动词,主句、从句都为肯定式,意为“某动作一直延 续到某点时间才停止He remained there until / till she
9、 arrived.You may stay here until the rain stops.2)否认句:主句谓语动词必须是非延续性动词,从句肯定式,意为“某动作知道某时间才开 始”。He wont go to bed until / till she returns.3) till 不可以放在句首,而 until 可以:Until you told me I had no idea of it.4) not. until句型中的强调和倒装用法:It was not until you told me that I had any idea of it.Not until you told
10、me did I have any idea of it.2. before 和 since1)假设表达“还未就”“不到.就.”“.才”“趁还没来得及”时,需用连词before:We had sailed four days and four nights before we saw land.航行了四天四夜才看到陆地。We hadnt run a mile before he felt tired.我们跑了还不到一英里他就累了。Please write it down before you forget it.趁你现在还没忘记把它记下来。Before I could get in a wor
11、d, he had measured me.我还没来得及插话他就给我量好了尺寸。Before they reached the station, the train had gone.他们(还没)到火车站前,火车已经开走 了。2) It will be + 一段时间 before sb. does sth.多久之后才It wont be + 一段时间 before sb. does sth.过不多久就It will be half a year before I come back.It wont be long before we meet again.3) since从句的谓语动词一般是非
12、延续性动词,主句的谓语动词是延续性的或者是反复发生 过的动作。Since从句的时态是一般过去时,主句的时态是现在完成时或现在完成进行时。I have written home four times since I came here.She has been working in this factory since she left school.4)在It is + 一段时间+ since从句句型中,如果谓语动词是延续性的,时间从动作结束时 算起;如果从句的谓语动词是非延续性的,时间从动作开始时算起:It is three years since the war broke out.战争爆
13、发有三年了。It is three years since she was in our class.她离开我们班有三年了。It is three years since she lived here.他不在这住有三年了。It is three years since I smoked a cigar. 我不吸烟有三年了。It is three years since I began to smoke.我吸烟有三年 了。3. every time, each time, next time, the first time, any time, all the time 等名词短语用来弓I 导时
14、 间状语从句,表示“每当,每次,下次”:Each / Every time I was in trouble, he would come to help me out.Next time you come, do remember to bring your son here.The last time she saw Jane, she was lying in bed.The first time I climbed onto the wall, I felt nervous.You are welcome to come back any time you want.二、地点状语从句.
15、引导地点状语从句的附属连词有where和wherever.指具体地点时,从句可用于主句之前 或之后,表示抽象条件的含义时,从句须放在主句之前:We should go where we are needed most.Where there is a will there is a way.Wherever there is smoke, there is a fire.1 .注意区分where引导的定语从句与状语从句:Youd better make a mark where you have any questions.Youd better make a mark at the plac
16、e where you have any questions.三、原因状语从句引导原因状语从句的附属连词有:because, as, since, now that1. because语气最强,在以下情况下必须用because: 1)回到why提出的问题;2)引导表语 从句;3)用在强调原因状语从句的强调句中;4)附属连词前有only, just, simply修饰。He didnt speak to you. It was because he didnt recognize you.You shouldnt get angry just because some people speak
17、ill of you.2. since和as引导的从句强调的是结果,不强调原因,因此它们引导的从句通常在主句前。 Since在语气上比as强,表示自然的因果关系,相当于“既然”的意思。As常用于讲话人认 为某种理由很明显或对方很熟悉,不需要突出。Now that的意义和用法和since相同,其中 that可以省去。Since a lot of people make mistakes in life, youd better give him a chance.Since the two children were brought up in the south, they have neve
18、r seen snow.As it was getting late, we had to go home.As he didnt know much English, he often took a dictionary with him.Now (that) you are free today, you may have a rest at home or go out for a walk.3. for虽然常翻译成“因为二但它并不是一个附属连词而是一个并列连词,不是用来说明一 种原因,而是用来表示一种附带,或补充解释,或说明,或表示一种推理,它引导的句子不 能放在句首,前面有逗号隔开。
19、We must start early, for we have a long way to go.He must have done it by himself, for there was no one else in the room.四、目的状语从句in order that 与 so that引导的从句中需用情态动词,in order that比s。that正式,引导的状语从句可放在主句之前 或之后,而so that引导的从句只能放在主句之后:ril speak slowly so that you can understand me.In order that we might s
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