各位读者一定可以注意到在the后面的名词都有所指，举例来说，the university指那所作者要去念的大学，他的妈妈知道他所说的是那一所大学。the dormitory指那间他已搬进去住的宿舍。凡是有所指的名词前面，原则上都应该加the。
哪里用了〝a〞呢？注意，我们用了两次 a taxi/a very old one 读者应该不难看出为什么这里我们不能用the，而一定要用a。
mary: "hello, this is mary. who is calling?"
john: "hi, this is john. how are you?"
mary: "i am doing fine. in fact, i am studying for the final examination now."
john: "oh, i am sorry. when will the exam be over?"
mary: "this friday."
john: "then, can we have dinner friday evening?"
mary: "ok, where are we going to eat?"
john: "how about the chinese restaurant called four seasons?"
mary: "that is all right with me. when do we meet?"
john: "how about six o'clock?"
mary: "that's it. see you friday evening at 6 o'clock at the four seasons."