We need an apple and a knife.
我们需要一个苹果和一把刀子。
1. a和 an的区别
不定冠词有 a[+]和 an[+ Q]两种形式， a用于辅音(不是辅音字母)开头的词前。 an用于元音(不是元音字母)开头的词前。
a boy, a university, a European country
u是元音字母，但发音是[ U(]，是辅音。
an hour， an honor， an island
h是辅音字母，但它不发音，它的音标是是元音。
an elephant， an umbrella， an egg
2( 1)不定冠词的用法
①泛指—类人或物。
eg. This is a pencil case.
②指不具体的某个人或物。
eg. I met an old man On my way home.
③用在序数词前,相当于 another.
eg. There’s a third boy near the shop.
④表示“每—(个)”,相当于 every.
eg. They have music lessons twice a week.
必背
give a lesson take a bath have a rest
教(一堂)课 洗(个)澡 休息
have a talk have a fever have a good time
听报告 发烧 过得愉快
have (take) a walk have a headache have a nice trip
散步 头疼 旅途愉快
a lot of, a lot, a little, a few, a glass of, such a/ an, have a word with, have a look, have a try, have a swim, a quarter, half an hour, three times a day, have a talk, give a talk, ten Yuan a kilo
( 2)不定冠词的位置
①不定冠词—般放在所修饰的单数可数名词前。
eg, a bike, an egg
②当名词被 such, what, many修饰时，不定冠词放在这些词之后。
eg.It took me half an hour to finish my homework.
He left in such a hurry that he forgot to close the door.
What a dangerous job it is!
Many a man has gone to the big cities for work.
③当名词前的形容词前有 so, how, too等词时，不定冠词应放在形容词之后。
Eg. She was so nice a girl that she took the blind man to the station.
How nice a film this is!
④当名词前面有形容词和 quite, rather, very时，不定冠词放在 quite, rather之后, very之前。
eg.It is quite a good book.
That is rather a useful too 1.
This is a very interesting story.
