We need an apple and a knife. 我們需要一個蘋果和一把刀子。 1.a和an的區(qū)別 不定冠詞有a[+]和an[+Q]兩種形式，a用于輔音(不是輔音字母)開頭的詞前。an用于元音(不是元音字母)開頭的詞前。 a boy, a university, a European country u是元音字母，但發(fā)音是[U(]，是輔音。 an hour ，an honor ，an island h是輔音字母，但它不發(fā)音，它的音標是是元音。 an elephant， an umbrella， an egg 2(1)不定冠詞的用法 ①泛指—類人或物。 eg. This is a pencil case. ②指不具體的某個人或物。 eg. I met an old man On my way home. ③用在序數(shù)詞前,相當于another. eg. There’s a third boy near the shop. ④表示“每—(個)”,相當于every. eg. They have music lessons twice a week. 必背! give a lesson take a bath have a rest 教(一堂)課 洗(個)澡 休息 have a talk have a fever have a good time 聽報告 發(fā)燒 過得愉快 have(take)a walk have a headache have a nice trip 散步 頭疼 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)不定冠詞的位置 ①不定冠詞—般放在所修飾的單數(shù)可數(shù)名詞前。 eg, a bike, an egg ②當名詞被such, what, many修飾時，不定冠詞放在這些詞之后。 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當名詞前的形容詞前有so, how, too等詞時，不定冠詞應放在形容詞之后。 Eg. She was so nice a girl that she took the blind man to the station. How nice a film this is! ④當名詞前面有形容詞和quite, rather, very時，不定冠詞放在quite, rather之后,very之前。 eg.It is quite a good book. That is rather a useful too1. This is a very interesting story.