1.表示某些機構或設施的名詞以及home，town等名詞前(常與at，in，to等連用，表示一般概念或抽象意義)。
例如：
The children go to school from Monday to Friday.
I don't think you can find it at home.
2.表示家庭成員的名詞前(這些名詞接近於專有名詞的'意義，第一個字母常大寫)。例如：
Father was not at home till 5o'clock.
Mother is cooking at the kitchen.
3.表示呼語或感嘆意味的名詞前。例如：
Be careful，young man!It's dangerous.
Boy，come here and join us!
4.表示球類運動的名詞前(與play連用時)。例如：
The students play football after school every Tues- day.
They like playing basketball and volleyball.
5.表示交通工具的名詞前(常與介詞by連用)。例如：
Some students in our class often go to school by bus.
We'll visit Shanghai this holiday by plane.
