(几乎同时) when (at or during the time that )既可以表示在某一点的时候,又可表示在某一段时间内,主句与从句的动作或事情可以同时发生也可以先后发生。 It was raining when we arrived.(指时间点) When we were at school,we went to the library every day.(在一段时间内) while while意思是“当……的时候”或“在某一段时间里”。主句中的动作或事情在从句中的动作或事情的进展过程中发生,从句中的动词一般要用延续性动词。在when表示a period of time时,两者可以互换。 Please don’t talk so loud while others are working. He fell asleep while/when reading. Strike while the iron is hot.(用as或when不可,这里的while意思是“趁……”) 4.引导时间状语从句的连接词除上述外还有: (1)till,not...until...,until Don’t get off the bus until it has stopped. He waited for his father until/till it was twelve o’clock. (2)hardly/scarcely...when,no sooner...than表示“刚……就” We had hardly got/Hardly had we got into the country when it began to rain. No sooner had he arrived/He had no sooner arrived than she started complaining. (3)directly,immediately,the moment,the minute,the instant,as soon as,意为“一……就” He made for the door directly he heard the knock. The moment he saw his mother,he burst into tears. (4)each time,every time Each time he came to my city,he would call on me. 1.although与though可以引导让步状语从句,不能与but连用,但可以与yet连用。 Although/Though they are poor,(yet)they are warmhearted. 2.even if或even though引导让步状语从句,表示“即使”、“纵然”,用来使人注意下文所强调内容的性质。 I’ll get there even if/though I have to sell my house to get enough money to go by air. ◆让步状语从句的核心考点 3.no matter后接who,what,where,how等疑问词引导让步状语从句,也可以在这类疑问词后面加上ever构成whoever,whatever,wherever,however等。但在引导名词性从句时只能用“疑问词+-ever”类词。 Don’t trust him,no matter what/whatever he says. I will eat whatever you give me. No matter how hard the work is,you’d better try to do it well. 4.as也可以引导让步状语从句,需将从句中的表语、状语以及谓语中的实义动词提前至从句句首,引起倒装;作表语的单数可数名词前如有冠词,冠词需省去。though引导的从句也可以倒装,但although引导的不可以。 Child as(though) he is,he knows a lot. Much as I like it,I won’t buy. Try as he would,he couldn’t lift the heavy box. 5.while也可以引导让步状语从句,表示“尽管”,比though/although语气弱。while引导的让步状语从句一般要位于句首。 1.表示不知道的原因时用because,即说话人认为听话人不知道,因此because从句是全句最重要的部分,通常它被置于主句之后。 You want to know why I’m leaving?I’m leaving because I’m fed up with the boss. 2.表示已经知道的原因时用as或since,即某种原因在说话人看来已经很明显,或已为听话人所熟悉,因此它是句中不很重要的部分。since要比as正式一些,它们通常被置于主句之前,但有时却相反。 Seeing all of the children already seated,he said,“Since everyone is here,let’s start.” ◆原因状语从句:because,as,since,now that 3.下列情况下只能使用because: (1)在回答why的问句时; (2)在用于强调句型时; (3)被not所否定时。 ◆地点状语从句:where,wherever等 Make a mark wherever you have any questions. We will go where the Party directs us. ◆目的状语从句:that,so that,in order that 注意:目的状语从句中的谓语动词常与情态动词连用,否则可能是结果状语从句,不可置于句首。 He got up early so that he could catch the early train. ◆结果状语从句:that,so that,so...that...,such...that... 注意:so+形容词/副词+that从句;such+名词+that从句。 She is so good that we all like her. He is such a good teacher that we all respect him. ◆方式状语从句:as,as if/though I’ll do as I am told to. It looks as if it is going to rain. ◆条件状语从句:if, unless, so/as long as, in case, once, on condition that等 You can use my bike as long as you return it on time. ◆注意状语从句中从句的省略现象 1.连词+非谓语动词 Don’t speak until (you are) spoken to. Unless (it is) repaired,the washing machine is no use. Look out while (you are) crossing the street. He opened his lips as if (he is going )to speak. 2.连词+形容词 常见的有if necessary,if possible,when necessary,if any等。 If (it is) necessary,I will go there. Make a careful plan if (it is) possible. 3.连词+介词短语 He looked around as if in search of something. 返回 连词在高考中的应用 ◆连词与语法填空 并列句和状语从句中的连词是语法填空题中常考点之一。连词分为并列连词和从属连词,常考的并列连词有and,but,or,so,while,when等;常考的从属连词有if,although/though,once,unless,when,where,since,before,after,because,as等。 典题试做1 在空白处填入适当的连词 1.One day,the cow was eating grass
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