假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。
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。
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。
    Tina，14，is a hard-working student.She studies hard，follows the rules at school，and do whatever her parents，teachers and even friend tell her to do.She seems to be used to say "yes" to everything.But Tina is not always happy about this. "Sometimes my friends invite me do something together，but actual I've got other plans，" Tina said. "And sometimes people ask too much favors from me.For an example，every day a student is on duty to keep the classroom clean，and there is one girl whom always wants to change shifts（换班） with me.I don't feel like helping her，because I just cannot say ‘no'." "I must make a change，" Tina thought to her.