1、时间状语从句时间状语从句引导时间状语从句的从属连词（短语）引导时间状语从句的从属连词（短语）1、when 当时 引导的从句中可以用延续性动词，也可以用短暂性动词。When it began to rain,Ben was helping his mom make dinner.天开始下雨时，本正在帮他妈妈昨晚饭。2、while 正当时；正在时 引导的从句中，谓语动词必须是延续性动词，常用进行时。While John was taking photos,Mary bought a drink.当约翰在拍照时，玛丽买了饮料。3、as当时 表示一件事情正在发生，另一件事情也在进行中，通常只用于一般过
2、去时。As time passed,things seemed to get better.随着时间推移，情况似乎变得更好了。when 和 while when 既指时间点，也可指一段时间；while 只指一段时间，因此when引导的时间状语从句中的动词可以是短暂性动词，也可以是延续性动词，而while从句中的动词必须是延续性动词。When the teacher came in,we were talking.当此句改变主从句的位置时，则为：While we were talking,the teacher came in.4、after 在之后 表示主句的动作发生在从句的动作之后。He b
3、ecame an English teacher,after he graduated from school.他毕业后称为了一名英语老师。5、before 在之前 表示主句的动作发生在从句的动作之前。They need to think before they act and make good decisions for themselves.他们需要在行动前思考，为自己做出正确的决定。6、since自以来 主句的谓语用现在完成时，而且须是延续性动词；从句的谓语主句的谓语用现在完成时，而且须是延续性动词；从句的谓语用一般过去时，而且须是短暂性动词。用一般过去时，而且须是短暂性动词。Youv
4、e been happy since I first met you.自从我第一次见到你，你一直很快乐。Lily has stayed at home since she left school.since 译作译作“自从自从以来以来”，除了用作连词，除了用作连词，引导时间状语从句外，还可以用作介词，后接：引导时间状语从句外，还可以用作介词，后接：(1)时间点：时间点：I have stayed in that country since 1995.要求：谓语用现在完成时，而且须是延续性动词。要求：谓语用现在完成时，而且须是延续性动词。2)一段时间一段时间+ago：They have live
5、d in that house since two years ago.要求：谓语用现在完成时，而且须是延续性动词。要求：谓语用现在完成时，而且须是延续性动词。7、until/till 直到 如果主句用肯定式，主句的动作持续到从句的动作时就停止。We played basketball in the playground until it began to rain.我们一直在操场打篮球，直到天下雨。如果主句用否定式，构成not until结构，表示“直到才”，主句的动作直到从句的动作时才停止。We began to play basketball until it stopped raini
6、ng.直到雨停了我们才开始打篮球。8、as soon as 一就 所引导的从句常用一般现在时，主句用一般将来时。I will give you a call as soon as I arrive home.我一到家就给你打电话。9、whenver 等于no matter whenWhenever I try to read this book,I feel sleepy.无论何时我试图读这本书，我都感到瞌睡。注意注意：当when、as、after、before、until（till）、as soon as等引导时间状语从句时，主句和从句的时态采取“主将从现主将从现”原则。till和until
7、2）在“not.until.”句式中不能用till替代3）句首通常只用until,不用till。You cant go home until 5 p.m.Until then,I knew nothing at all about it.在那之前，我对此事一无所知。用 since,till or until填空1.I have been crazy about playing basketball _ I was a little boy.2.The weather has been awful this week.The rain did not stop_ yesterday evenin
8、g,so we could not practise basketballfor seven days.3.We played basketball in the playground this afternoon_ it was getting dark.4.It is the first time we have played basketball_ Monday.We enjoyed ourselves very much.5.I waited for 20 minutes at the bus stop_ the bus arrived.6.It is Friday evening.I
9、 will not go to bed_ I finish watching my favourite TV programme.2）指紧接着发生的两个短动作，主从句都用 He took out his English books as soon as he sat down.whenever Whenever she comes,she brings a friend.她每次来都带个朋友。2).ad.不论何时,每逢 Ill discuss it with you whenever you like.你愿意什麽时候我就什麽时候和你商量这件事.用 as soon as 或 whenever填空1
10、.David often goes to play basketball_ school is over.2.He watches the NBA_ there is a game on TV.3._ he talks about basketball,he gets excited.4._ he learnt that the NBA players would come to China,he tried his best to get a ticket.主句和时间（条件）状语从句的时态一致一般有三种主句和时间（条件）状语从句的时态一致一般有三种情况情况 1、“主句从现主句从现”主句用一般
11、将来时，从句用一般现在时。常见的使用“主将从现”的连词有：1）表示时间：when,until,till,after,before,whenever,as soon as等 2）表示条件：if,unless,as long as等 2、“主祈从现主祈从现”如果主句是祈使句表示将来的动作，条件或时间状语从句用一般现在时表示将来。If he comes back,let me know.如果他回来了，告诉我。3、“主情从现主情从现”如果主句有情态动词，条件或时间状语从句用一般现在时表示将来。If you feel hungry,you should eat something.如果你感到饿了，你应该
12、吃的东西。If you keep trying,you can make progress quickly and find a lot of fun in learning it.如果你继续尝试，你可以很快取得进步，并在学习中找到乐趣。4、“主完从过主完从过”since引导的时间状语从句用一般过去式，主句用现在完成时。He has lived here since he was born.自从出生以来，他就住在这里。They have been good friends since they came to this school.自从他们来到这个学校，他们就是好朋友。()1.You can
13、t watch TV_ you finish your homework.A.before B.if C.while D.after()2.-Whats your plan this summer holiday?-Ill go to Beijing_ the school team ends A.whenever B.till C.as soon as D.before()3._ I was in the US,I made many American friends.A.While B.Although C.Unless D.Until()4.Many students didnt realize the importance of study_ they left school.A.when B.until C.as D.after()5.You should go over your test paper_ you hand it in.A.before B.when C.while D.after
