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同学你好～

the是定冠词， 这句话里面特指双方都知道的事物“那个房间”。room是可数名词，一般出现时前面一定要有冠词a/the或者用复数形式，只说单数可数名词of room是错误的。

下面提供一些the用法的详解供你参考：

定冠词the的用法
1、表示某个或某些特定的人或物
Tom is the monitor of our class. 汤姆是我们班的班长。（不是别的班的）
2、特指双方都明白的人或物
I am cold, would you please close the door.  我很冷，请把门关了。(双方都知道是哪个门）
3、世界上独一无二的事物
天空是蓝色的。The sky is blue.
地球绕着太阳转。The earth goes around the sun.
4、上文提到过的人或事
He has a pen and the pen is given by his sister.
5、用在序数词和最高级前面
第一the first 第二the second 第三the third
他是我们班最高。 He is the tallest in our class.
6、用在表示乐器的名词前
他会弹钢琴/拉小提琴/弹吉他......
He can play the piano/violin/guitar
7、用在姓氏的复数名词前
格林一家在看电视。The Greens are watching TV.
8、用在习惯用语中
在白天in the day(在晚上at night) 早上in the morning


名词前不用冠词的16种场合

1　专有名词、物质名词、抽象名词、人名、地名等名词前，一般不加冠词。
China, America, Smith
Air, water, and light are all matter.
2　可数名词前有物主代词、指示代词、名词所有格等限制时，不加冠词。
This dictionary is mine.
3　季节、月份、星期、节日、假日、一日三餐名称前一般不加冠词。
March, May Day, National Day, Children’s Day, Women’s Day ，Father's Day,
Have you had breakfast?
Spring is the best season of the year.
4 称呼语或指家用雇用的nurse、cook等名词前及表示头衔职务的名词作宾语、补语及同位语时，一般不加冠词。
What’s this, Father? We made him our chairman.
Ask nurse to put the child to bed. Professor Li.
5 学科名称、球类、棋类名称前不加冠词。
Do you study physics?
He likes playing football/chess.
6 复数名词表示泛指一类人或事物时前不用冠词。
They are peasants/ workers.
7 在与by连用的交通工具名称前不加冠词。
by car, by bus, by bike, by train, by air/ water/ land
但：take a bus, come in a boat, on the train/ bus需注意。
8 某些固定词组中不用冠词。
(1) 名词词组中：
husband and wife, brother and sister, body and soul, day and night, knife and fork
(2) 介词词组中：
to(at, from) school, in (to)class, in (to,at, from)university（college）,to（in, into, from）church, to(in,into, out of)prison(hospital, bed), to(at, from, out of)work, to(in, from) town, at (from)home, to(at)sea, at night(noon, midnight), by car (bus, bicycle, plane), on foot
注意：在有些词组中，有无冠词含义不同。
in hospital 住院（因病）
in the hospital　在医院（工作、参观等）
in front of　在前面，指某物体之外
in the front of　在前部，指某物之内
in charge of 　负责，主管 　　　
in the charge of 由……负责
out of question　没问题
out of the question　不可能
9 as引导的让步状语从句中，作表语的名词不带冠词。
Child as she is, she knows a lot of French.
10 系动词turn（作“变成”解）后作表语的单数可数名词前习惯不用冠词。
The young girl has turned writer.
= The young girl has become a writer.
11 在“单数名词 + after + 单数名词”（“一个接一个”）的结构中，单数可数名词前不加冠词。
She did experiment after experiment.
类似的还有：shop after shop, mistake after mistake
12 形容词的最高级前、序数词前也有不用定冠词的情况。
(1)“most + 形容词原级”作“十分、非常、极”解时，前面不用定冠词。
Oh, it’s most beautiful.
(2) 当两个形容词最高级并列修饰同一个名词时，第二个形容词前通常不用定冠词。
She is the tallest and fattest girl in our school.
(3) 当形容词最高级作表语，不表示与其他人或物相比时，其前不用定冠词。
The market in the country is busiest in winter.
(4) 形容词最高级前有名词所有格或物主代词时，不能用定冠词。
A wolf in a sheep’s skin is our most dangerous enemy.
(5)序数词前面一般加定冠词表示“第……”之意，但在second、third等词前加不定冠词表示“又一，再一”之意。
 a second; a third; a fourth; a fifth; a sixth; a seventh; an eighth
注意：下句中“a first”表示“第一名、冠军”。
He is a top student in our class, he often gets a first in maths.
13　no与such连用时应放在such之前，such后面的名词不用冠词。
No such thing has ever happened in this village.
14　never、ever置于作主语的名词前，这些名词前不用冠词。
Never did student study so hard.这个学生从未学得这么认真。
15　有时为了节省空间、时间、金钱和精力，或为了引起注意力，省去a(n)或the,这主要用于新闻标题、工商业文件、广告、电报、公告、提纲、书名等。
Conference opens.会议召开了。
16 单数或复数名词表泛指，其前不用冠词。
Paper can be made from wood or other materials.

祝你学习进步～