题目内容：

假定英语课上老师要求同桌之间交换修改作文，请你修改同桌写的以下作文。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。

When I was eight, my father bought me the new bike for my birthday. My brother offered to taught me how to ride. At first, he rode and let me watching. Then he explained me the skills of controlling the bike. Still puzzling, I got on the bike, but it didn’t move as expected. I lost my balance and fall off the bike. At once I burst into tear because I saw blood on the ground. While I stood up, my left leg hurt bad. Later, I learned to ride a bike. This experience told me that though some lessons were painful to learn them, yet we could benefit a lot.