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：在错的词下画一横线，并在该词下面写出修改后的词。
When I was four years old I got ill. I took medicine twice a day. The medicine had so a bitter taste that I took it mixed in
orange juice. The problem was that I can't still taste the medicine.
In a particular afternoon my mother brought the drink in. As
she gave it to me, the phone rang and she go to answer
it. I looked at the orange drink and decided I couldn't face them,
so I hid the glass behind a pile magazines. Of course, when
my mother was asked, "Have you already taken your medicine?"
I said, "Yes." I felt very pleased with me. The next day, my
mother found drink when she was doing the housework. She
looked at me serious and said, "It's bad to tell lies !"
