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1,盛年不重来一日难在晨及时当勉励岁月不待人的意思是什么

盛年不重来,一日难再晨。及时当勉励,岁月不待人:是东晋文学家、田园诗人陶渊明的《杂诗》八首之一,感叹时间一去不复返,勉励人们应抓紧时间做有意义的事情。

盛年不重来一日难在晨及时当勉励岁月不待人的意思是什么

2,when可以用在什么句式结构中

when 译为“当...时候 ”  [when有引导过去式]; when I was young,I used to walk to the school.当我小的时候,我过去经常步行去学校.  [when也引导一般现在时]; Switch off the tape when you leave the bath room.当你离开洗手间时,要关水龙头.

when可以用在什么句式结构中

3,ever当什么意思讲用现在完成时当什么意思讲可以不用现在完成时

1.一般用于疑问句中 eg.Have you ever been to beijing?2.若用在否定句中一般用never.eg.I have never gone to beijing.3.你说用于肯定句中可能与其他词的搭配egfor ever 永远ever since 自从ever so 非常ever and again 偶尔ever favorites是永远最喜欢的.4.还可以与疑问词连用构成however,whichever,whatever,wherever等引导让步状语从句

ever当什么意思讲用现在完成时当什么意思讲可以不用现在完成时

4,when 和 while 的 区别

when是短暂性动词,while是持续性动词,给你举两个列子,1 i was doing my homework while my mother was cooking in the kitchen.两个动作都是持续的。 2 i was watching TV when my father came back.其中"my father came back "就是短暂的动作。
when和while的区别 ①when是at or during the time that, 既指时间点,也可指一段时间; while是during the time that,只指一段时间,因此when引导的时间状语从句中的动词可以是终止性动词,也可以是延续性动词,而while从句中的动词必须是延续性动词。 ②when 说明从句的动作和主句的动作可以是同时,也可以是先后发生;while 则强调主句的动作在从句动作的发生的过程中或主从句两个动作同时发生。 ③由when引导的时间状语从句,主句用过去进行时,从句应用一般过去时;如果从句和主句的动作同时发生,两句都用过去进行时的时候,多用while引导,如: a. When the teacher came in, we were talking. 当此句改变主从句的位置时,则为: While we were talking, the teacher came in. b. They were singing while we were dancing. ④when和while 还可作并列连词。when表示“在那时”;while表示“而,却”,表对照关系。如: a. The children were running to move the bag of rice when they heard the sound of a motor bike. 孩子们正要跑过去搬开那袋米,这时他们听到了摩托车的声音。 b. He is strong while his brother is weak. 他长得很结实,而他弟弟却很瘦弱。 具体你可以参考这一段。 when,while,as引导时间状语从句的区别 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。 ① Why do you want a new job when youve got such a good one already?(get为短暂性动词)你已经找到如此好的工作,为何还想再找新的? ②Sorry,I was out when you called me.(call为短暂性动词)对不起,你打电话时我刚好外出了。 ③Strike while the iron is hot.(is为延续性动词,表示一种持续的状态)趁热打铁。 ④ The students took notes as they listened.(listen为延续性动词)学生们边听课边做笔记。 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。 ①When he had finished his homework,he took a short rest.(finished先发生)当他完成作业后,他休息了一会儿。 ②When I got to the airport,the guests had left.(got to后发生)当我赶到飞机场时,客人们已经离开了。 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。 ①When /While /As we were dancing,a stranger came in.(dance为延续性动词)当我们跳舞时,一位陌生人走了进来。 ②When /While /As she was making a phonecall,I was writing a letter.(make为延续性动词)当她在打电话时,我正在写信。 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。 ① As the time went on,the weather got worse.(as表示“随着……”之意) ② The atmosphere gets thinner and thinner as the height increases.随着高度的增加,大气越来越稀薄。 ③As years go by,China is getting stronger and richer.随着时间一年一年过去,中国变得越来越富强了。 ④The little girls sang as they went.小姑娘们一边走,一边唱。 ⑤The sad mother sat on the roadside,shouting as she was crying.伤心的妈妈坐在路边,边哭边叫。 4.在将来时从句中,常用when,且从句须用一般时代替将来时。 ①You shall borrow the book when I have finished reading it.在我读完这本书后,你可以借阅。 ②When the manager comes here for a visit next week,Ill talk with him about this.下周,经理来这参观时,我会和他谈谈此事。 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... ①I had hardly /scarcely closed my eyes when someone knocked at the door.=Hardly / Scarcely had I closed my eyes when someone knocked at the door.我刚一闭上眼,就有人在敲门了。 ②I had hardly /scarcely entered my room when the telephone rang.=Hardly /Scarcely had I entered my room when the telephone rang.我刚一走进房门,电话就响了
你记住第一条和第二条一般就可以了。
when是用来引导时间状语从句,while也是,但是when强调的是某个时间点,while强调一边|……一边……。比如我一边吃饭一边看电视,就要用while,主句要用进行时态,此外while还有表示转折的意思

文章TAG:盛年  重来  来一  及时  时当  
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