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。
注意：1．每处错误及其修改均仅限一词；
2．只允许修改10处，多者(从第11处起)不计分。
Is it all right students carry smart phones all the times? The opinions about that varies from person to person. Those for that think it is convenience for them to contact others, especially it is necessary in emergency.
Those like that, however, think students are not supposed to. In their opinion, some students can't resist a temptation to play games and watch something improper for them at improper time, wasting their precious time they should spend studying and taking sports. Besides, to playing games may cost them too many. As far as I'm concerning, students should value their studies, and safety more than other things. As for relaxation, we would better do what is beneficial for both mind and body.
