(2)称呼。可以直接用姓和名，如：Smith(姓)，John(名)，Wang，Weifang;也可用头衔加姓，如：Mr. Smith，Prof. Lin等。
从上面可以看出，便笺写作(Note Writing)实际上与书信写作(Letter Writing)大致相似，但有三点主要不同：
Dear Miss Stone，
I’m really sorry that I shall not be able to attend class today. I have got a fever of 39℃. Enclosed please find a certificate from the doctor of our college which says I must stay in bed for three days.
I’ll resume my studies as soon as I feel better.
You are late for an appointment with a professor. You also have books that are due at the library in a few hours. Write a note to your roommate asking if she could return the books for you. In return for the favor, offer to buy her lunch.
You should write about 100 words on ANSWER SHEET 2.
I have a big favor to ask you. I am late for my appointment with Professor Jones, and need to go directly to his office. I also have two books that are due back at the library this evening. As I will not be able to get to the library before it closes, I was wondering if you would possibly have the time to return the books for me.
I realize this is a big favor to ask of you, as you are also very busy. In return for help, I would like to buy you lunch tomorrow. Thanks in advance!