1、a/an的用法区别,Free powerpoint template: ,2,冠词a和an,a/an在英语中被称为不定冠词。它们表示一(个,只,本,件,块,片),在意义上没有区别。 用a/an时,我们必须记住两条基本原则:,a/an有不确定的意义。(即所说 的人、动物或东西对听者或读者来说 可能是不知道的) a/an只能用于单数可数名词之前。,Free powerpoint template: ,3,在英语中,液状、气状物体等很多都属于不可数名词,前面不能够带有不定冠词。 例如cola 可乐,milk 牛奶,water 水和 gas 汽油,等等。,例如:a book (一本书), an era
2、ser(一块橡皮),Free powerpoint template: ,4,此外还需注意a和an的发音:,n用于元音(以元音字母a,e,i, o,u开头的词大多都是)之前。,an,a(在平时讲话中发 音),用于辅音(不是辅 音字母)之前;,不定冠词a/an的用法规则,(1)不定冠词有有两种形式,a用在以辅音开头的词前,an用在以元音开头的词前 Eg: a man , a university, an egg, an hour, an hour,Free powerpoint template: ,5,(2)拼写以辅音字母开头读音却以元音开头的单词 Eg : hour, honest, hon
3、or等单词的拼写虽然以辅音字母 h开头,但其读音却以元音开头,因此,前面要用an An hour ago, an honest man accepted an honorable task. (一小时前,一位诚实的人接受了一项光荣的任务。),Free powerpoint template: ,6,(3)拼写以元音字母开头读音却以辅音开头的单词 Eg: useful, university, usual, European, united, one-eyed, one-way (这些单词拼写虽然以元音字母开头,但其读音却以辅音开头,因此,前面要用a) 英文字母前用a还是用an的问题 在26个英
4、文字母中,a, e, i, o, f, h, l, m, n, r, s, x等12个字母的读音是以元音开头的,其余字母则是以辅音开头的,Free powerpoint template: ,7,不定冠词a/an用法,(1)用在第一次提到的人或物,但不具体指明是哪一个 Eg: Long long ago, there was an old king who had a very beautiful daughter(很久很久以前,有一个年老的国王,他有一个非常美丽的女儿),Free powerpoint template: ,8,(2) 指人或事物的某一种类(泛指)。这是不定冠词a (an)的
5、基本用法。 Eg: She is a girl. 她是一个女孩 I am a teacher. 我是一名老师 Please pass me an apple. 麻烦递给我一个苹果 A tiger can be dangerous 老虎可能有危害性,Free powerpoint template: ,9,(3)用在做表语的单数可数名词之前,表示身份,职业 Eg:My mother is a teacher 我的妈妈是教师 (4)用在价格,速度,比率的表示法中,表“每一” Eg:We go swimming four times a week(我们每周游泳四次),Free powerpoint
6、template: ,10,(5)用在感叹句中 what+(a/an)+adj.+n.+主语+谓语+(it is). What a clever girl she is! 多么聪明的姑娘呀! What an interesting story it is! 多么有趣的故事呀!,Free powerpoint template: ,11,(6)不可数名词和复数名词前不用 Eg:Cats are afraid of dogs (猫怕狗) (7)表示数量,有“一”的意思,但数的概念没有one强烈。如: I have a mouth, a nose and two eyes.,Free powerpo
7、int template: ,12,(8)指某人或某物,但不具体说明何人或何物。 Eg:He borrowed a story-book from the library. A Wang is looking for you. 一位姓王的同志正在找你 A gentleman wants to see you 有位先生要见你,Free powerpoint template: ,13,Free powerpoint template: ,14,a table,a cat,a chair,a dog,a banana,an ice-cream,an umbrella,an egg,an orang
8、e,an apple,固定搭配 Eg; such a (如此的) ,a lot of(许多) a couple of/a pair of(一对),a dozen(一打),a great deal of (大量),a few(许多) 1,他是一个相当好的演员 He is quite a good actor 2,不要如此匆忙 Dont be in such a hurry,Free powerpoint template: ,15,1 . Thats_nice name. 2 . She_American girl . 3 . Its_English book . 4 . Hes_new nei
9、ghbour . 5 . Its_old desk . 6 . Shes_pretty girl . 7 . Its_ umbrella . 8 . Shes_famous actress .,Free powerpoint template: ,17,an,an,a,a,an,a,an,a,1.I am _(a, an)student. 2.There is _(a, an) elephant in the zoo. 3.You are _(a, an) good boy. 4.I have _(a, an) orange. 5.This is _(a ,an)new book. 6.Please take _(a, an )umbrella. 7.My father is _(a ,an) doctor. 8.There is _(a,an) orange on the table.,Free powerpoint template: ,18,a,an,a,an,a,an,a,an,Free powerpoint template: ,19,Thank you,