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 John,
How are you? I'm writing to tell you my concerns about some of your unhealthy habit. I don't mean upset you, so I really care about you.
John, I found that you didn't eat the vegetables when having dinners and that you love the junk food crazily. Besides, you refused to climb the mountain with myself, because you thought you would be out of the breath if you did it. But a healthy body is the basis of a success life. I do wish you can try some fresh vegetables. In addition, I want you to take exercise regular everyday, that will help you improve your physical health.
Looking forward to see your progress.
