原文：
Last Sunday, I went to the bookstore to buy some books that was recommended by my teacher. On the way, I met an old friend of mine. We decide to have a cup of coffee together. He told me about his new job, which sounded very interesting. After talking for nearly an hour, I realized that I have forgotten to buy the books. So I hurried to the bookstore, but it was already closed. I felt very disappointed.
答案与解析（每处错误及更正）：
1. that was → that were （books是复数，谓语动词应用were）
2. decide → decided （全文叙述过去事件，应用过去时）
3. have forgotten → had forgotten （“意识到”时“忘记”已发生，应用过去完成时）
4. but it was already closed → and it was already closed （此处为顺承关系，非转折）
改错常见考点口诀（重庆高考英语）：
真题高频出错点（直接背）：
1. 时态错误（过去时vs现在时，过去完成时标志）
2. 名词单复数（可数名词无冠词必复数？注意上下文）
3. 连词误用（并列用and，转折but，因果so/because）
4. 代词指代（he/she，it/they，主格宾格）
5. 介词固定搭配（look at/listen to等）
答题技巧（蒙题备用）：
格式必须对：文中划线单词，答案写“XXX → XXX”。