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1、时间状语从句定义：用表示时间的连词连接一个句子作状语，这样的主从复合句就是时间状语从句。连接时间状语从句的连接词有 ：when, before, after, while, as soon as, until, since这里要注意一点的是，如果主句是一般将来时，从句只能用一般现在时表示将来意义。时间状语从句由 when, while 引导的时间状语从句。When you think you know nothing, then you begin to know something.当你以为自己一无所知的时候，你就是在开始知道一些事物了。Strike while the iron is ho
2、t.趁热打铁。You can feel the air movi ng as your hand pushes through it当你的手在空气中挥动的时候，你就能感觉到空气在流动。Our headmaster laughed as she spoke.我们的校长边谈边笑。主要时态：主现从不限；主过从四过；主将从现。when, while和as的区别（1） when引导的从句的谓语动词可以是延续性的动词，可以是瞬时动词。并且when有时表示就在那时”。例如：When she came in, I stopped eating她进来时，我停止吃饭。（瞬时动词）When I lived in t
3、he countryside, I used to carry some water for him.当我住在农村时， 我常常为他担水。（延续性的动词） We were about to leave whe n he came in我们就要离开，就在那时他进来了。（2） While引导的从句的谓语动作必须是延续性的， 并强调主句和从句的动作同时发生（或者相对应）。并且while有时还可以表示对比。例如：While my wife was reading the newspaper, I was watching TV. （was reading是延续性的动词，was reading禾口 was
4、 watching同时发生）。I like playi ng football while you like playi ng basketball.我喜欢踢足球，而你喜欢打篮球。（对比）（3） As表示“一边一边” ，as引导的动作是延续性的动作，一般用于主句和从句动作同时发生；as也可以强 调“一先一后。例如：We always sing as we wall我们总是边走边唱。（as表示“一边一边”）As we were going out, it began to snow当我们出门时，开始下雪了。（ as强调句中两个动作紧接着先后发生，而不强调开始下雪的特定时间）由 before禾口
5、after引导的时间状语从句注意：before引导的从句不再用否定式的谓语，并且当 before引导的从句位于主句之后，有时译成“就，才”。还要注意主句和从句之间的时间关系。当主句用将来时，从句总是用现在时；如果before引导的主句谓语用的是过去完成时，则从句动词多用一般过去时，这样以便体现动作发生的先后。After表示主句动作发生在从句动作之后。 主句和从句的动作的时间关系正好与before引导的从句相反。例如：It will be four days before they come back.他们要过四天才能回来。Ein ste in almost kno cked me dow n
6、before he saw me爱因斯坦几乎把我撞倒才看至U我。My father had left for Can ada just before the letter arrived.我父亲恰好在信到之前去加拿大了。They had not bee n married four mon ths before they were divorced.他们结婚还不至 U四个月就离婚了。After you thi nk it over, please let me know what you decide.你仔细考虑过以后，告诉我你是怎样决定的。After we had fin ished the
7、 work, we went home.完成工作之后，我们回家了。（从句用过去完成时，主句用一般过去时）由till或 until引导的时间状语从句。till和until 一般情况下两者可以互换，但是在强调句型中多用until。并且要注意的是：如果主句中的谓语动词是瞬时动词时，必须用否定形式；如果主句中的谓语动词是延续性动词时，用肯定或否定形式都可以，但表达的意思不同。till不可以用在句首，而until可以放在句首。例如：I did nt go to bed until （till） my father came back直到我父亲回来我才上床睡觉。It was not un til the
8、meet ing was over that he bega n to teach me En glish 直至 U散会之后他才开始教我英语。I worked un til he came back .我工作到他回来为止。I did nt work un til he came back.他回来我这才开始工作。Please wait un til I arrived.在我到达之前请等我。由since引导的时间状语从句。since引导的从句的谓语动词可以是延续性的动词，又可以是瞬时动词。一般情况下，从句谓语动词用一般过去时，而主句的谓语动词用现在完成时。但在It is +时间+since从句的句
9、型中，主句多用一般现在时。例如：I have bee n in Beiji ng si nee you left.自从你离开以来，我一直在北京了。Where have you bee n si nee I last saw you?自上次我和你见面以后，你到哪里去了？It is four years since my sister lived in Beiji ng.我妹妹不在北京住有四年了。It is five mon ths since our boss was in Beiji ng.我们老板离开北京有五个月了。 由 as soon as,等引导的时间状语从句。（了解）这些连词都表示“一
10、就”。例如：I will go there directly I have finished my breakfast.吃完早饭，我立即到那里去。The mome nt I heard the n ews, I haste ned to the spot.我 一听至叶肖息，马上赶至 U了出事地点。As soon as I reach Canada, I will ring you up.我一到加拿大，就给你来电话。注意：hardly(scarcely, rarely)，when / before, no soonerthan 相当于 as soon as之意。主句用过去完成时，从句用一 般过去
11、时。当 hardly, scarcely, rarely和no sooner位于句首时，主句应用倒装语序。例如：He had no sooner arrived home tha n he was asked to start on ano ther journey.他刚至 U家，就被邀请开始另一旅程。No sooner had the sun show n itself above the horiz on tha n he got out of bed to comme nee work.太阳刚从地平线上升起, 他就起床劳动去了。Hardly had I sat down when he
12、stepped in.我刚坐下，他就进来了。He had hardly falle n asleep whe n he felt a soft touch on his shoulder这个阿拉伯人刚要入睡就感到肩膀上被轻轻一触。由by the time引导的时间状语从句。注意时态的变化：在一般情况下，如果从句的谓语动词用一般过去时，主句的谓语动词用过去完成时；如果从句的谓语动词用一般现在时，主句的谓语动词用将来完成时。例如：By the time you came back, I had fin ished this book 到你回来时，我已经写完这本书了。By the time you
13、come here tomorrow, I will have finished this work.你明天来这儿的时候，我将已经完成此工作了。 由 each time, every time等引导的时间状语从句。例如：Each time he came to Harbin, he would call on me.他每次来哈尔滨，总是来看我。When ever that man says To tell the truth ” , I suspect that hes about to tell a lie 每当那个人说说实在话”的时候，我 猜想他就要说谎了。You grow youn ge
14、r every time I see you.每次遇至 M尔，见你更年轻了。 由 as long as禾口 so long as引导的时间状语从句。这两个连词表示“只要“例如：You can go where you like as long as you get back before dark你可以随意到哪里去，只要在天黑以前回来就行。I will fight aga inst these con diti ons as long as there is a breath in my body!只要我一息尚存，我就要反对这种境况。一、when “当时”，引导时间状语从句时，从句用于表示主句
15、动作发生的特定时间。如：The days get Ion ger whe n spri ng comes. = Whe n spri ng comes, the days get lon天到来时，白天变得更长了。二、before在之前”，引导时间状语从句时，表示主句动作发生在从句动作之前。如：Close the door before you leave the roc离开房间前关上门。三、after在之后”，引导时间状语从句时，表示主句的动作发生在从句的动作之后。如：I went to school after I fini shed my breakfa吃完早饭后我就去上学了。四、as soon as 一就”，引导时间状语从句时，表示主句动作紧接着从句动作发生。如：I ll call you as soon as I get hon我一到家就给你打电话。词是非延续性动词时，主句要用否定形式，即“ notuntil/till意为“直到才”。如：I ll wait here until/till the rain stops我将在这里等着，直到雨停。You can t go home un til/till you fin ish your work 直到你完成你的工作，你才能回家。时态的呼应和从句的位置状语从句的两手绝活
