a an the 三個是冠詞（想必LZ知道的哈）
以下十種情況一般是不加冠詞的...
1.表示星期、月份和泛指的季節(jié)名詞前.例如：
Her birthday is in July.
2.表示三餐的名詞前.例如：
Let’s have a walk after supper.
It’s time for lunch.
3.表示地點、人物的專有名詞前.例如：
He is from Australia.
Please give this book to Henry.
4.表示球類運動、棋類游戲的名詞前.例如：
Many girls like playing volleyball.
He is playing chess with his son.
5.表示交通工具的名詞前.例如：
You’d better go by bus.
Lots of students go to school by bike.
6.表示物質(zhì)的名詞前.例如：
We can’t live without air ,water or food.
Light travels much faster than soud.
7.表示抽象概念的名詞前.例如：
Every one needs love.
Happiness lies in health.
8.表示一類人或事物的復數(shù)名詞前.例如：
We are students.
Book and newspaper are our good teachers and friends.
9.稱呼語,表示職位(只有一人擔任的)或頭銜的名詞前.例如：
Did you receive my letter,Mother?
They made me monitor.
10.某些固定結構中的名詞前.例如：
at noon,on time,go home,go to work,for example,on duty,ete.
我上網(wǎng)搜了搜.還有另外的答案.十二種情況:
1．泛指的復數(shù)名詞前：
People have always dreamed of flying high up into space．人們一直夢想能在高空中飛翔.
2．泛指的抽象名詞前：
Life is always presenting new things to children．生活總是不斷地呈現(xiàn)給孩子們新的東西.
3．泛指的物質(zhì)名詞前：
Iron and steel play an im portant role in industry．鋼鐵在工業(yè)生產(chǎn)中起到重要的作用.
4．一日三餐的名稱前：
Have you had breakfast?你吃過早飯了嗎?
5．語言或?qū)W科的名詞前：
He can speak not only English but also Japanese．他不但會講英語而且還會講日語.
6．季節(jié)、月份、星期、節(jié)日等名詞前：
Autumn is the season of harvest．秋天是收獲的季節(jié).
June 1st is Children's Day．六月1日是兒童節(jié).
We have English classes on Monday and Thursday．我們周一和周四有英語課.
7．球類運動或棋類游戲名稱前：
They all like to play football．他們都喜歡踢足球.
8．有物主代詞、指示代詞、不定代詞等修飾的名詞前：
Each age has its pleasures and pains．每個年齡層次有不同的樂趣和苦惱.
I want this car,not that car．我想要這輛小汽車,不是那輛.
There is some water in the cup．杯子里面有些水.
9．大多數(shù)專有名詞前：
Do you know Nanjing Road in Shanghai?你知道上海的南京路嗎?
10．用作稱呼語或表示頭銜的名詞前：
W hat are you reading,Boy?孩子,你在讀什么?
He is head of the factory．他是工廠的廠長.
11．用于表示家庭成員或 nurse,cook,teacher等具有our nurse（cook,teacher）意義時：
Teacher was very pleased with our work．老師對我們的工作很滿意.
M other was being m ade up looking like the ideal,m iddle-aged housewife．媽媽慢慢變成了典型的中年家庭主婦.
12．用于固定詞組中：
M y son has gone to school．我兒子已經(jīng)去上學了.
Did you travel by train?你是乘火車旅行的嗎?
They walked on foot covering great distances．他們步行走了很遠的路.
We had a good time in town last Sunday．上個星期天我們在小鎮(zhèn)上過得很愉快.
You shouldn't use such bad language in
front of the children．你不應該在孩子們面前說這樣難聽的話.
I wish I could do something for you in return．作為回報我希望能為你做些什么.
希望我的答案能夠幫助到你.