7。When为什么不能取代as, when什么时候可以取代as? When 和as的区别是什么?when可不可以引到短语? as 可能强调"随着", 表示伴随动作, 好像还是一个进行中的过程,
when,while,as显然都可以引导时间状语从句,但用法区别非常大。 一、when可以和延续性动词连用,也可以和短暂性动词连用;而while和as只能和延续性动词连用。 二、when从句的谓语动词可以在主句谓语动作之前、之后或同时发生;while和as从句的谓语动作必须是和主句谓语动作同时发生。 1.从句动作在主句动作前发生,只用 when。 2.从句动作和主句动作同时发生,且从句动作为延续性动词时,when,while,as都可使用。 3.当主句、从句动作同时进行,从句动作的时间概念淡化,而主要表示主句动作发生的背景或条件时,只能用 as。这时,as常表示“随着……”;“一边……,一边……”之意。 。 三、when用于表示“一……就……”的句型中(指过去的事情)。 sb.had hardly(=scarcely) done sth.when...=Hardly / Scarcely had sb.done sth.when.
只能用when 的句型: 放句中,主句是进行时,从句是短暂动作,表示这时突然 从句是短暂动作:When I got up, I heard the bell ring. 当我起床的时候,我听见铃响了。 只能用while的句型: 1. 表示对立予盾的对比,这时while相当于but。I am poor while you are rich.我很穷,你却很富有。 2. 表示“趁着还来得及的时候,赶快.... 趁热打铁.Strike while it is hot. 只能用as的句型: 属下列情形时,只用as, 而不用when或while。 A) 用于表示同一个人的两种动作交替进行,指"一边……,一边……"。如: He looked behind from time to time as he went forward. B)表示两个同步发展的动作或行为,译为"随着……"。如: As children get older, they become more and more interested in the things around them. C)表示两个短促行为或事件几乎同时发生。如: Just as the flying worm hit her face, she gave a loud cry. D) 后接名词表示某一年龄段时,用as。如: As a young man, he was active in sports.
as 与like的区别 1. 表示象...一样时, as接从句, like 接短语 Do everything as I do. 象我一样做。 He is/looks like his mother. 他长得像他妈妈。 2. as当介词接短语时,表示作为...不是象...一样的意思.like 当动词时,是喜欢的意思,不要搞混为象... As a League Member,I should take everything in the lead. 作为一名团员,我应该起带头作用。 while的用法 一、while意为“当……时候”,指一段时间,不能用来表示一个时间点。 While the discussion was still going on, George came in. 当讨论还在进行时,乔治走了进来。 二、while意为“而;然而”,表示转折。 There're plenty of rain in the southeast, while there's little in the northeast. 东南部雨量充足,而西北部则很少下雨。 三、while意为“虽然;尽管”,表示让步。 While I admit his good points, I can see his shortcomings. 尽管我承认他的优点,但我还是能看到他的缺点。 四、while意为“只要”,表示条件。 We can surely overcome these difficulties while we are closely united. 只要我们紧密地团结一致,一定能克服这些困难。 五、while从句中的省略。 当while从句中的主语与主句的主语一致,且含有be的某种形式时,从句中的主语连同be可同时省略。 While in London, he studied music and painting. 在伦敦时,他学习音乐和绘画。 六、while可用作名词,意为“一会儿;一段时间”。 作名词用时,主要用于短语中: after a while “过了一会儿”; all the while “一直,始终”; a short / little while ago “刚才”; once in a while “偶尔,间或”; wait / rest(for) a while “等 / 休息一会儿”。.
As的用法 一、 as作连词的用法: 1. 作"当……的时候",引导时间状语从句。注意与when、 while的用法区别。(同上) 2. as=since, 作"既然"、"由于"解,引导原因状语从句,常用来表示已为人们所知或显而易见的原因或理由。如: As / Since you're not feeling well, you may stay at home. 3. as=in the way that, 作"像"、"按照……的方式"解,引导方式状语从句。如: He speaks English as Americans do. 4. 用于as...as...或not so/ as...as...中,前一个as是副词,后一个as是连词,引导比较状语从句。如: I don't speak English so/ as well as he does. 5. 作"虽然"、"尽管"解,引导让步状语从句。常用倒装语序,即adj. /adv. / n.+ as +主语+谓语+主句。如: Child as he is, he knows a lot. (child前不用冠词) 二、 as作关系代词,引导定语从句,作"正如"、"这一点"解。如: He is very careful, as his work shows. 另外,当先行词被the same, such等词修饰时,常用as来引导定语从句。如: Such a clever boy as he can learn anything quickly. 三、 as作介词的用法: as引导的介词短语大多用作状语,as译为"作为";少数情况可引起宾语补足语。如: As a League member, I'll take the lead in everything. (状语) She works as a doctor. (状语) They have me as one of their own children.(引起宾语补足语)
When后边接名词的一个例子(人还有疑问??) When still a boy of six, Bob was sent away from home. (章振邦 p1155) 8.divorce后面的that能不能省掉。 定语从句中that的省略 由that引导的定语从句并且that做主语,那么that不能省略 9.A of B 结构的修饰问题 --- A of B+that定语,其修饰的主体是B ? --- A of B+分词,分词有可能是修饰A ,也有可能是修饰 B? 跳跃和就近都有可能,不能武断哪种肯定对.OG1就是明显的就近修饰,OG254则是跳跃修饰. 不能把修饰方向作为判断答案标准,可能从其他语法点着手.. A of B结构,除非有主谓一致的提示,不然只能逻辑判断。 *one of Ns that中that后面的动词用复数 the only one of Ns that 中that后面的动词用单数
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