高考英语（人教新课标）一轮复习语法讲解课件：从句 2.15连词when,while,as的用法区别.ppt

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1、13_ the day went on,the weather got worse.A.With B.When C.While D.As 15 连词when,while,as 的用法区别 _ volleyball is her strength,shes also great at basketball.A.Since B.Once B.C.Unless D.While12D。考查让步状语从句。while表示“虽然，尽管”，符合语境。尽管排球是她的强项，但是她也擅长打篮球。解析/显隐解析/显隐D。句意:随着时间的推移，天气变得越来越糟糕。as表示发展、变化的情况。难 点 自 测难 点 诠 释

2、15 连词when,while,as 的用法区别难 点 诠 释(1)作并列连词,意思是“这时”(at this time),常用于下列句型：was/were doingwhen某事正在进行,这时发生了另外一件事。We were walking when I heard a cry of help.was/were about towhen即将做某事,这时发生了另外一件事。I was about to leave when it began to rain.15 连词when,while,as 的用法区别难 点 诠 释had just donewhen某事刚发生，就发生了另外一件事；某事情还没有

3、持续多长时间，就发生了另外一件事。We had just sat down when someone knocked at the door.We hadnt been asleep for long when we heard a terrible noise.15 连词when,while,as 的用法区别难 点 诠 释(2)表示“既然”。Why do you want a new job when youve got such a good one already?(3)表示“虽然”，然而，可是”，一般位于句中。He walks when he can take a taxi.15 连词

4、when,while,as 的用法区别难 点 诠 释(1)表示对比或比较，意为“然而，而”。He likes dancing while his brother likes singing.(2)表示“虽然，尽管”，用于句首。While she loves her students,she is very strict with them.15 连词when,while,as 的用法区别难 点 诠 释 表示发展、变化的情况时，只能用as。As he grew older,he lost interest in everythingexcept gardening.when,while,as的用

5、法共同点在说明事情发生的背景时,使用when,while,as都可以。如:He broke his leg when/while/as he playing football.表示“当的时候”,可以使用when,也可以使用while。when从句中的谓语动词可以是延续性的,也可以是非延续性的,而while从句中的动词必须是延续性的。as引导时间状语从句时,表示“一边一边”。强调主句和从句的动作同时进行。例如:1.It was nine oclock when I got home.(非延续)2.He was reading while he was waiting for a bus.(延续）

6、3.The girl sings as she goes to school.(同时发生)15 连词when,while,as 的用法区别典例2In some places women workoutside to earn money _ men look after their children at home.A.but B.while B.C.because D.though典例1He was about halfway throughhis meal _ a familiar voice came to his ears.A.why B.where C.when D.whileC。w

7、hen作并列连词,意思是“这时(at this time)”。句意:他的饭大约吃到一半的时候,他听到一个熟悉的声音。解析/显隐解析/显隐B。while在此处表示对比。句意:在有些地方,女人在外工作挣钱而男人在家看孩子。典 型 例 题 15 连词when,while,as 的用法区别12One protester said that the govern-ment could have done something to stop the spread of the demonstration(举行)_they took no effective measures.A.as B.since C.while D.when11 How can you expect to learnanything _ you never listen?A.in case B.even if B.C.unless D.when解析/显隐解析/显隐即 时 突 破D。when在此处的意思是“既然”。句意:既然你根本就不听,你怎能指望学到东西呢？D。根据语境可知选when,表示“然而,可是”,一般用于句首。句意:一位抗议者说，政府本来能够做点什么来阻止游行的蔓延,可是他们并没有采取有效的措施。15 连词when,while,as 的用法区别