增加：在缺词处加一个漏字符号（^），并在其下面写出该加的词。
删除：把多余的词用斜线（\）划掉。
修改：在错的词下划一横线，并在该词下面写出修改后的词。
Dear Tom,
How is it going? Knowing that you are interesting in Chinese calligraphy, I'm writing to tell you it's my pleasure to help you learn them.
As I have been practicing it for many years, I have much valuable experience and know exact what you need for calligraphy. So I will prepare some tool that are of great use for you, like the writing brush, ink and paper, that are necessary for practicing calligraphy. As you know, I had piano lessons from Monday to Sunday. I will be free on Sunday afternoon. Thus, you can come to my home at 2:00p. m. on every Sunday if it is convenient for you.
I' m sure that by learn Chinese calligraphy, you will have a good understanding of Chinese culture than ever before. I'm looking forward your reply.
Yours sincerely,
Li Hua
