a和an的用法
来源:百度知道 编辑:UC知道 时间:2024/05/11 03:31:04
【a和an的用法】
a加在以辅音开头的名词前,如a book,a pen。
an加在以元音开头的名词前,如an egg,an apple。
注意
有时a,an后面紧接的不是单数名词,而是a (an) +形容词+单数名词的形式。这时判断用a还是an来表示“一个”的概念时,要看形容词开头字母的发音,而不是看名词。
【用法汇总】
1.一(个,件,…):
He had a book under his arm.他手臂下夹着一本书。
He was a boy from a poor home. 他是来自穷苦家庭的孩子。
I saw a girl watering the flowers. 我看见一个女孩在浇花。
Anna had a boy friend named James. 安娜有个男朋友名叫詹姆斯。
He arrived half an hour ago. 他是半小时前到达的。
He is an able man. 他是一个能干的人。
Give him an inch and he will take a mile. 他会得寸进尺。
The book is based on an actual case. 这书是根据一个实际案例写的。
He decided to put an advertisement in the newspapers. 他决定在报上登一份广告。
2.任何…都:
A bird has wings. 鸟有翅膀。
A square has four sides. 正方形有四条边。
A dog is an animal. 狗是动物。
3.每(一):
He comes home once a week. 他每周回一次家。
The doctor told him to bathe his eyes twice a day. 医生让他每天洗两次眼睛。
The ducks were force-fed several times a day. 这种鸭子每天强行