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：在缺词处加一个漏词符号（^），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。
I was playing at my cousin house. Since his family was rich than mine, he had more toys than I did. There was one on particular I'd always wanted. I put into my pocket when he wasn't looking. I guessed, even at that age, I would never be able to enjoy to playing with the toy or faced my cousin again; I would always know I'd done something wrong. Late on, my aunt drove me home. When she dropped me off, I pulled out the toy slow and gave it back. She knows what had happened, but she thanked me and ever mentioned it again.
2Fe2+ + I2
L·mol -1