关于介词与连词的问题

2024-11-24 16:35:27
推荐回答(5个)
回答1:

一、as作连词的用法   1. as...as的用法   as...as意为"和……一样",表示同级的比较。使用时要注意第一个as为副词,第二个as为连词。其基本结构为:as+ adj./ adv. +as。例如:   (1)This film is as interesting as that one.这部电影和那部电影一样有趣。   (2)Your pen writes as smoothly as mine.你的钢笔书写起来和我的一样流畅。   其否定式为not as/so +adj./ adv. +as。例如:   This dictionary is not as/so useful as you think.这本字典不如你想象的那样有用。   若有修饰成分,如twice, three times, half, a quarter等,则须置于第一个as之前。例如:   Your bag is twice as expensive as mine.你的袋子比我的贵一倍。   几个关于as...as的常见句型:   (1)as...as possible   Please answer my question as soon as possible.请尽快回答我的问题。   (2)as...as usual/before   She looks as pretty as before.她看起来和以前一样漂亮。   (3)as long as... (引导条件状语从句)   It took us as long as three years to carry out the plan.我们花了长达三年的时间才完成这项计划。   (4)as far as   He walked as far as the railway station yesterday evening.昨天傍晚,他一直散步到火车站。   (5)as well as   She cooks as well as her mother does.她烧菜烧得跟她母亲一样好。  2. as用作连词引导时间状语从句   as与when,while都是引导时间状语从句的从属连词,含义都是"当……的时候"。但它们有区别:用when时,从句的动作可以与主句的动作同时发生,也可以先于主句的动作发生;用while时,从句的动作为一过程,主句动作与从句动作同时进行或在从句动作过程中发生;用as时,主句和从句的动作同时发生,具有延续的含义。例如:   (1)It was snowing when he arrived at the construction site.他到达工地时,天正在下雪。   (2)He was watching TV while his mother was cooking.他母亲做饭时他在看电视。   (3) You will grow wiser as you grow older.你会随着年龄的增长而越来越聪明。   3. as用作连词引导原因状语从句   as,because,since都可以表示因果关系,连接原因状语从句,含义是"因为,由于",但它们有区别:because表示的语气最强;as一般放在句首,语气较弱,较口语化;since常常用在书面语中,表示多为对方已知的、或稍加分析便可得知的原因,有时可译作"既然"。例如:   (1) He will succeed because he is in earnest.他一定会成功,因为他很认真。   (2) Since you are so sure of it he”ll believe you.既然你对此如此有把握,他会相信你的。   (3) As rain has fallen, the air is cooler.因为下过雨,空气比较清爽。   4. as作连词引导让步状语从句   as与although (或though),however (或no matter how)等都可以引导让步状语从句,含义是"虽然,尽管",但它们有区别:although语气稍正式些,可放在句首,也可放在句中,主句中不能再用but,但可以用yet;as所表示的语气较强,引导的让步状语从句用倒装语序;however引导让步状语从句时,它的后面可跟形容词或副词,也要用倒装语序。例如:   (1) Although he is quite old, he still jogs every day.他虽然年纪相当大,仍然每天慢跑。   (2) Strange as it may seem, nobody was injured in the accident.这次意外虽然显得令人不可思议,却没有人受伤。   (3) However hard he may try, he will not attain his goal.无论他怎样努力也达不到目标。 二.as作介词的用法 1."作为","以……身份"。例如:   He came to China as a tourist five years ago.他五年前以游客的身份来过中国。 2.像,如同,跟…一样: I am a good student as him. 我跟他一样都是好学生。三.than作为连词1.在表意愿的句型中,构成 would do sth rather than do sth, would rather do sth than do sth或prefer to do sth rather than do sth结构,意为“宁愿做……而不……”。例如:
The soldiers would rather die than surrender. In winter the children prefer to watch TV at home rather than go camping. 2.no sooner …than意为“一……就……”,引导时间状语从句,且当此结构置于句首时,主句要倒装。例如:
I had no sooner reached home than it began to rain. 我一回到家就下雨了。 No sooner had I reached home than it began to rain. (No sooner 置于句首要倒装)四.than作介词,引导比较的第二部分 I am older than her.我比她大。 总之,作为连词时通常引导句子,人称代词作句子的主语,当然用主格。作介词,后面只能连接词或短语,人称代词用宾格。as,than的用法很多,不要单纯从词法上记忆,要掌握它的句型,短语,熟记每个用法的例句。

回答2:

我补充一点: 比较专业的 :-) She reads faster than him. 这句话其实是这样来的:She reads fast. He reads fast. But she reads faster than he does (一般用does代替reads以免重复). 结论:She reads faster than him. "than"后面不是一个句子,所以它后面的词可以用宾格。She reads faster than he does. "than"后面是一个句子(有主谓结构),因此必须视为连词。介词一般不连接句子的。比如:Mary was absent yesterday because she was ill. "because"是连词,连接一个句子。Mary was absent yesterday because of her illness. 加了of介词,是因为后面是一个短语,不是句子。 再回过头来看 She reads faster than him 这一句。严格地说,这里的than仍然是连词,而不是介词,因为它连接的部分只是一个省略谓语成份的句子。因此,这个句子里的him完全可以用he,即:She reads faster than he. (相信我,这句话没错!)同理,She is older than he 也是对的。事实上,在较早的时候,语法学家认为 She reads faster than him 这一句中用 him是错误的,必须用 he!只是后来人们口语上更习惯使用宾格him才逐渐地被人们接受了这个说法。 再看一个句子:The news surprised Tom more than me. 这里一般必须用me,因为这句话是 The news surprised Tom more than it surprised me 省略。

回答3:

than 做介词时用于两者比较,后面只加比较的对象。做连词时加一个句子。比如介词He is older than me.连词He is older than I am.as 做介词是当作的意思,连词是像··一样,因为等意思如 介词The kitten uses that box as its bed.连词 It is just as you like

回答4:

只要看看句式是否含有比较等级结构,如:as...as...;比较级+ than等,此时的as和than就是连词。因此第1句用he。as也可以引导方式状语从句,此时的as也是连词,因此,第2句也用he。

回答5:

第一句是她看书比他快,than是连词, 固定句型是 “比较词。。。。than" ,....比。。。。更。所以用he第二句,是我和他一样都是好学生。as...表示和。。。。一样,是介词,所以用him