3) 用于表示價格、速度、比率等名詞前，如five pence a kilo, sixty kilometers an hour, four times a day等。
4) 用于下列這樣的固定短語中。如a couple, a dozen, half a dozen, a hundred, a lot of, a great many, a great deal of, a large amount/quantity of, a good number of 等。
I’ve done a great deal of work today. (不可數)
What a large number of books you have! (可數)
It’s a good five miles(=at least five miles, perhaps mote) to the station.
5) 以元音開頭的單詞前不定冠詞用an, 如：an apple, an egg, an item, an old man, an umbrella, an hour; 以輔音開頭的單詞前不定冠詞用a university student, a humorous man。
EXERCISE l
A. Put a or an before each of the following:
1. motel (汽車游客旅館) 2. unusual approach
3. honest boy 4. awkward situation
5. exit (出口) 6. urgent message
7. unique opportunity 8. extremely exciting film
B.Translate the following into English：
1.一座新辦公樓 2.一位旅行社代理人
3.一位美國科學家 4.一天的郊游
5.一張印度郵票 6.一次心臟病發作
7.一個先進國家 8.一個有意思的劇本
EXERCISE 2
Fill in the blanks with a or an where necessary:
1. Telephone is very important means of communication.
2. Mothers often tell small children stories before bedtime.
3. I'll pay you thousand year. It’s not enormous salary but after all you are completely unskilled worker.
4. —You’11 get shock if you touch live wire with that screwdriver(螺絲起子). Why don’t you get screwdriver with insulated(絕緣的)handle?
5. — I’m not wage-earner; I’m self-employed man. I have business of my own.
—Then you’re not worker; You’re capitalist!
6. —I have hour and half for lunch.
—I only have half hour — barely time for smoke and cup of coffee.
7. It travels at just under thousand miles hour.
8. I have never known such hot weather.
EXERCISE 3
Insert a or an where necessary:
A.
1. I had very bad night; I didn’t sleep wink (眨眼;打盹).
2. This man has honesty that we all appreciated.
3. Mr. Brown had vision of new and happier Europe.
4. It’s time you had holiday. You haven’t had day off for month.
5. There is hourly service of buses in this route.
6. It is great honour to be invited to such gathering.
7. 1 wouldn’t climb mountain for $ 1, 000! I have horror of heights.
8. Children usually learn the difference between right and wrong at early age.
9. I can’t tell you definitely yet. I'll have word with my wife about it and tell you our decision tomorrow.
10. If boy is not making satisfactory progress at school, his parents should seek advice from his teacher.
B.
1. This is big problem, but not too big problem for us to solve.
2. He had square nose, grey hair and brown skin. She had never seen so handsome man.
3. However great disaster he suffered, John never gave up.
4. Many shipwrecked sailor has been rescued by our brave coastguards(海岸警衛隊).
5. Such urgent need requires prompt action.
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