七年级英语语法之状语从句.docx

英语状语从句的、的、状语从句是在句中做状语的从句，由从属连词引导，表示时间、地点.原因.结果、让步、比较、条件.方式等。1 .时间状语从句引导时间状语从句的连词：when, while, as , till, until, not until 以及 since, ever since,every / each time 和 whenevero 表示“当。的时候”when引导的时间状语从句可表示持续动作或短暂动作；可表示与主句的动作同时发 生，或先于主句的动作，但两个动作接连发生。while表示某动作与主句的动作同时发 生，且持续一段时间。as表示两个动作同时发生，从句动作持续时间较短，可译为“一 边，一边.”；有明表示两个动作正在发展变化，作“随着.”讲。When I reached the booking office, all the tickets had been sold.当我到售票处的时候，所有的票都已经卖完了。While there is life there is hope.活着就有希望。Bill sang as he worked.比尔边工作边唱歌。ril go to see a film when I have finished my homework.当我完成作业后，我将去看一场电影。till与until可通用，二者都可表示主句谓语动词所表达的动作继续到从句谓语动词所 表达的动作发生时为止。till引导的从句多位于句末，until引导的从句可位于句首，且not until放在句首时，主句的主、谓语需倒置，用以加强语气。Fil stay at my office till / until it stops snowing.直到雪停之前我都会呆在办公室。Until you told me I had no idea of what Mary said.直到你告诉我我才知道玛丽说了什么。Not until the teacher came did we begin the experiment.直到老师来了我们才开始做实验。since与ever since引导的时间状语从句通常用一般过去时，主句用现在完成时， ever since较since语气更重。every time / each time 与 whenever意义相近，常与一般现在 时或一般过去时连用，突出动作发生的经常性。Joe is a good horseman; he has been riding since he was six.乔是一名优秀的骑手；他从六岁时就开始骑马了。2 .目的状语从句引入目的状语从句的从属连词常见的有:that, so that (为了)，in order that (较正式)，lest, for fear (that), in case似防，以防)。句中的谓语常由 can, could, may, might, would,Should等情态动词加动词原型构成，表示“以便，为了。The chairman hurried the meeting so that / in order that it might end before dark.主席加速了会议的进程以便能在天黑之前结束。Shut the window for fear (that) it may / might /should rain. 关上窗户以免下雨。The President must reject this proposal lest it should cause violence.总统必须拒绝这项提议以免发生暴力行为。Take you umbrella in case it rains / (should) rain. 带上你的雨伞以防备下雨。1.1. 因状语从句引入原因状语从句的从属连词有：because, as, since,表示“由于，因为，既o O O O O Obecause比as, since语气更强，以why开头的问句只能用because回答；as 表示原因时，其从句常位于句首；as和since常表示已知的原因；for补充说明原 因，常位于句子后部。I like to eat the watermelon from refrigerator because it is not only sweet, but also cold. 我喜欢吃冰箱里的西瓜，因为它又甜又凉。As all are here now we rush to the station at once.大家都到了，那咱们就马上杀往车站吧。Since no one is against it, we'll adopt the proposal.既然没人反对，我们将采纳这项计划。4 .条件状语从句引导条件状语从句的连词有if, unless, as / so long as等等，表示“如果，只要。“。If the teacher comes tell me that please.如果老师来的话，麻烦告诉我一声。You will never succeed unless you work hard.除非努力，不然你永远成功不了。I would come to help you immediately so long as you call me.只要你招呼我，我就会立即前来帮忙的。5 .让步状语从句引导让步状语从句的连词主要有though, although, even though等等，表示“虽然，尽 管，无论”Though Jimmy was very tired, he kept on working.尽管杰米非常累，可是他继续工作。He insisted doing it although I warned him not to.尽管我警告过他不要做，但他还是坚持做了。Even though I become a millionaire, I shall always be thrifty with my money.尽管我成了百万富翁，但我会一直很节省的。However (=No matter how) loudly you cry, you won't be heard.无论你如何喊叫都没有人能听见。Whoever (=No matter who) rings, tell him I'm out.无论谁来电话，告诉他我出去了。6 .比较状语从句引导比较状语从句的连词有as.as, more.than等等，表示“与。相同，比。更。”She is as tall as Tom (is),他和汤姆一般高。The young girl is almost as peevish as an old lady (is peevish).那女孩儿像老太婆一样脾气乖戾。more引入不同等程度的比较，than引入的从句中，和主句相同的成分可以省略，但不同质的比较，一般不省。John behaves more politely than Bob (does).约翰比鲍勃更有礼貌。The house is much taller than it is wide.这所房子的高远大于它的宽。