大家好,乐乐来为大家解答以下的问题，关于名词前什么时候加a an，名词前什么时候用an这个很多人还不知道,那么今天让乐乐带着大家一起来看看吧！

一、不定冠词a, an的用法 1.不定冠词a用在以辅音开头的名词前，an用于以愿意字母开头的名词前 A．用在单数可数名词前表示一类人或事物 A student should be polite. A school is a place where student study. B．首次提到某物 Once upon a time, there was a beautiful princess. C．a有every之意 We have three meals a (every) day. D．a有one之意，但不如one强烈 I have got a (one) car outside the building. E．用于某些固定词组中 a little, a few, a lot of, in a hurry, have a rest, have a cold, make a living 2.不定冠词的特殊用法 A．用于序数词前，不表示顺序，而用来表示“又一，再一”之意。

I want to try a third time. B．与most以及形容词原形连用，修饰名词，这是most表示“非常”的意思。

This is a most interesting book. C．用在一些专有名词前或人名前，表示“像……那样的人”，“某个……”。

A Mr. White rang you this morning. I’m going to buy an Olympus. D．用在quite, rather, half, such等词后，用在how/ so + 形容词后 It’s so cold a day. 二、定冠词the的用法 1.表特指，或表示特定的或上文已提到的人或事物。

Can you see the woman in red? He saw a man standing at the door. And the man was looking at him, too 2.用在单数可数名词前表示特定的一类。

The snake is a dangerous animal. 3.用在世界上独一无二的事物前。

the moon, the sun 4.用在演奏的乐器前。

I like playing the guitar. 5.用在序数词前。

The first month of a year is January. 6.用在表示方位的名词前。

Hainan is in the south of China. 7.用在形容词副词的最高级前。

He is the tallest in his class. 8.用在姓氏的复数前表示夫妇二人或一家人。

Sandy and Sue has already met the Blakes. 9.用在某些形容词前，表示一类人。

the poor, the rich, the old We should take good care of the old. 10.用在“the+比较级，the+比较级”中表示“越……越……” The more, the better. 11.在“动词+某人+介词+定冠词+人体某一部分”这 以结构中，习惯上用the，而不用物主代词。

The ball hit him on the head. 12.用于江河、海洋、山脉、群岛、沙漠等专有名词前。

The Yellow River, the Pacific Ocean, the Himalayas 13.用于含有普遍名词的专有名词前。

the Summer Palace, the Great Hall of the People, the Great Wall 14.用于一些固定的短语中 in the afternoon, in the end, all the time, at the age of, by the way, on the way home 三、不用冠词的情况 1.在表示人名、地名、国家名的专有名词前不用冠词。

2.在一类人或事物的复数名词前不用冠词。

I like ice-creams. 3.在不可数名词前不用冠词。

Water is important to us. 4.在节日、假日、星期几、月份、季节、日期前不用冠词。

March 8 is Women’s Day It’s Monday today. in January/ spring 5.在球类运动、一日三餐、棋类前不用冠词 What do you eat for breakfast? play chess play football/ basketball/ baseball/ badminton/ volleyball/ golf have breakfast/ lunch/ supper 6.学科、语言、称呼语的名词前不加冠词。

We have Chinese, maths, English and some other subjects. 7.与by连用的交通工具前，表示乘坐某种交通工具时，不加冠词。

by bus/ car/ air/ plane/ boat/ bike/ ship/ sea 另：on foot 8.名词前有this/that等修饰时，不加冠词。

I don’t like this sweater, please show me another. 9.两个名词表示相对关系时，不用冠词。

father and son, husband and wife They are doctor and patient.。

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