1. （指已提到的人〔物　〕)(used to refer to a person, thing, mentioned previously)
2. （指说话人与听者已知的人〔物　〕)(used when what is discussed is obvious)
3. （用于独一无二的事物前）(used before a unique thing)
4. （与形容词最高级和序数词连用）(used with super and ordinal word)
5. （在单数名词前表示一类人〔物　〕)(used with a singular noun to refer to a whole class)
6. （用于江河、山脉等名称之前）(used before names of rivers, mountains, etc.)
7. （与乐器名称连用）(used before the musical instrument)
8. （表示数量）每；每一　(used with the word referring to a unit of quantity, time, etc.)
9. （用于形容词前表示一类人）(used before adjective)

　It's my room. The room is bright and clean.　这是我的房间。这房间明亮整洁。
　Look!A car has stopped there. The car is very beautiful.　瞧！一辆汽车在那里停下了。那辆汽车可真漂亮。
　Do you like the book?　你喜欢这本书吗?
　How did you like the film?　你觉得这部电影可以吗?
　The sun is like a great ball of fire.　太阳像个巨大的火球。
　We have landed men on the moon.　我们已把人送上了月球。
　September is the ninth month of the year.　九月是一年中的第九个月。
　This is the best book I have ever read.　这是我所看过最好的一本书。
　The horse is a useful animal.　马是有用的动物。
　The pine is an evergreen tree.　松树是常青树。
　The Pacific Ocean is the biggest ocean in the earth.　太平洋是地球上最大的海洋。
　He is good at the piano.　他擅长弹钢琴。
　I'd like to learn the guitar.　我想学习弹吉他。
　The worker is paid by the hour.　这个工人的薪资按小时计算。
　There are 16 ounces to the pound. 　16盎司合1磅。
　The old are apt to catch a cold.　老人容易患感冒。

　［词源］古英语thē（这，那）