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。
Rope skipping is a sport suitable for people
of all ages. People skip rope for fun and exercises.
Every student is able to learn to skip. You
can skip alone and with your classmates. If you skip alone, you will need short
rope about double the long of your height. You should turn the rope slowly so
that you can skip safely. It might be help if you can sing a rhyme while skips.
When you skip rope, your heart beats faster than usually and your body is stressful.
Therefore, stop for a rest after you injure yourself.
So, picking up a rope, find a silly rhyme and
start skipping.
