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。错误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，并在该词下面写出改正后的词。

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。

A smile is an attitude in life. In our life, there may be something unpleasant. For an example, being misunderstood by our classmates and failing in an exam. These unpleasant things may make us feel badly. Then what shall we do? Why not try learn to smile? Smiling to ourselves can bring back our confidence and make us forget unhappy things because sometime the greatest enemy is us. We should also learn to smile to others. It will help us have more friend. A smile is such a widely-used language that everybody could understand it. We have a wonderful world if our life is full of smiles.