I'msureI'vegotalowmark.这句中的a是不是一定要加?什么情况下名词前可以不加冠词?如题.

Question

I'm sure I've got a low mark.这句中的a是不是一定要加?什么情况下名词前可以不加冠词?
如题.

Answer 1

一定要加.
定冠词有哪些基本用法
不论可数名词还是不可数名词,单数名词还是复数名词,前面都可以用定冠词 the.定冠词具有很强的特指性,一般用来特指某些人或某些事物.具体用法如下：
1.指某个或某些特定的人或事物,或复述上文提过的人或事物.例如：
(1) I can't find the broom.Can you see it?
我找不到扫帚,你能找到吗?
Yes,I can.It's behind the door.
我能.它在门后.
(2) Class Three have a map.The map is on the wall of their classroom.
三班有幅地图,挂在他们教室的墙上.
2.用于带有限制性后置定语的名词之前.例如：
The man in the corner is my father.
在角落的那个人是我的父亲.
Is this the girl you saw yesterday?
这就是你昨天见到的那个女孩吗?
3.用于指世界上独一无二的自然现象,或表示方位等的名词前.例如：
The sun rises in the east and sets in the west.
太阳从东方升起,西方落下.
In the evening,when the sun goes down,the sand is almost red.The sky is red
too,so it is very beautiful.
傍晚时分,太阳西斜,沙子几乎变成了红色.天空也变成了红色,所以极其漂亮.
4.定冠词也可以用于单数名词前,表示某一类人或事物.例如：
The tiger is a dangerous animal.
老虎是一种危险的动物.
This is easy for the teacher.
这对教师来说是容易的.
5.在表示乐器名词前,用定冠词.例如：
Can you play the violin?
你会拉小提琴吗?
I'm learning the piano.
我在学钢琴.
6.定冠词与表示计算单位的名词连用,含“每”、“每一”的意思.例如：
This cloth is sold by the yard.
这种布按码出售.
Our car does 30 miles to the gallon.
我们的汽车一加仑汽油能跑30英里.
单数可数名词前何时不加冠词
英语中单数可数名词出现时,通常要在前面加冠词或有其他限定词对其加以修饰.但在某些情况下,单数可数名词可以单独出现,既不需加冠词,也不需要用其他限定词修饰.
1.连系动词 turn （变成）后作表语的单数名词前习惯上不加冠词.如：
The young man has turned writer.
Did he turn singer?
2.用作同位语、宾语补足语、主语补足语或表语的单数可数名词,如果表示头衔或独一无二
的职务时,其前往往不加冠词.如：
I would make him king over the earth.
He was elected chairman of the meeting.
3.介词 by 后跟的运输工具类名词,表示手段、方法时,其前通常不加冠词.如：
He came here by bus.
My sister goes to school by bike every day.
4.表示季节、球类、一日三餐等名称的单数名词不表示 具体的某一事物,而只表示一个时间
地点、方式等抽象概念时,其前不加冠词.如：
Trees turn green in spring.
He always has breakfast at 7:00 in the morning.
5.称呼语,如：father,mother,cook,nurse,teacher 等名词前不加冠词.如：
Here they are,Father.
Shall we hand in our exercise-books now,Monitor?
6.用在“表示类型的名词 + of ” 这一结构后的单数可数名词前,一般不加冠词.如：
Is this kind of radio made in China?
7.有介词或连词连接的两个相同的、成对的或关系密切的单数可数名词前一般不加冠词.如：
They work day and night.
He would talk to his son face to face.
8.单数可数名词被用来指它本身,或者表示国籍时,通常不加冠词.如：
Are you American?No,I am Chinese.
9.在 go/come to...和 in/at...的搭配中,表示不确切地点的名词前通常不加冠词.如：
My father is in hospital.I must go to look after him.
My sister and I go to school every day.
10.当单数可数名词作表语又被 enough,no 等修饰时,通常不加冠词.如：
He is teacher enough to work out the problem.
Xiao Wang's mother is no writer.
11.man 表示人类或男人的总称时；woman 表示妇女的总称时,其前一般不加冠词.如：
Man will conquer nature.
Woman should have equal right as man.
12.在一些习语中,单数可数名词前不加冠词.如：
on earth 究竟,in fact 事实上,in place of 代替,take place 发生,in line 排
队,一致,for example 例如,take part in 参加,on foot 步行,等.