连词but,however,although,though,while区别.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,【,总结归纳,】,but,与,however,都表示“但是,然而,”,都可以引导并列句,但二者用法有些区别,。,1.,从语义上看,but,所表示的是非常明显的对比,转折的意味较,however,要强,。,2.,从语法上看,but,是个并列连词,而,however,是个连接副词。,3.,从语序上看,but,总是位于它所引出的,分句之首,而,however,却可位于分句之,首、之中或之尾。,4.,从标点上说,but,之后一般不使用逗号,但,however,则通常用逗号与句子其他部,分分开。,but,however,He knows so many difficulties are in,front of him.He will not,_,give up.,however,while,的用法,1.,表示对比,意为“而,;,然而”。,2.,引导时间状语从句,意为“当,时候,;,在,期间”,强调某一段时间内主句和从句的动作在同一时期发生,while,从句中的动词通常是持续性动词。,He is short,while,his brother is tall.,While,my mother was cooking,the phone rang.,3.,引导让步状语从句,意为“虽然,尽管”,多放在句首。,While,he is a little child,he knows many things about knowledge.,While/Although/Though,although,的用法,although,为从属连词,意为“虽然,尽管”,引导让步状语从句。注意以下两点,:,1.although,在大多下数情况下可与,though,通用,但,though,可用于一种不以其为首的让步状语从句,这种从句须,以形容词、名词或动词,(,原形,),等开头,整个从句须置于主句之前。这时,although,不能替换,though,。,Tired,though,he was,he went on working.,2.although/though,所引导的从句不能与,but,and,so,however,等连用,但可以和副词,yet,still,等连用。,Although/though,he is a little child,but,he knows many things about knowledge.,Although/though,he is a little child,he knows many things about knowledge.,正确表达,Although/though,he is a little child,yet,he knows many things about knowledge.,正确表达,错误表达,Have you been to New Zealand?,No,Id like to,_.,A.too B.though C.yet D.either,I do every single bit of housework _,my husband-Bob just does the dishes,now and then.,A.since B.while C.when D.as,One cant feel the air;_,it,does exist.,2.The children were playing outside,_ Mary was writing a letter.,3._ my uncle is old,he looks very strong and healthy.,however,while,Although,用,but,however,although,though,while,填空,4.The car was old,_ it was in,excellent condition.,5.Some people waste a lot of food _,others havent enough to eat.,6.I thought those figures are correct.,_,I have recently heard that,they were not.,but,while,However,