增加：在缺词处加一个漏字符号(Λ)，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。
It was raining hardly outside, that made it difficult for me to go home for lunch. Just as I was wondering what I should eat at noon, I saw a familiar figure passed by our classroom. I rushed out and it was my mother, who is already in the fifties, that brought me lunch, in spite the heavy rain. In China, many parents make great sacrifices for our children. But what had the children done in return？All too often, most children just take it for granted that their parents should serve for them unconditionally. My dear mum or dad, thank you very much for bringing me up. How shall I do for you?
