一全文逐句语法解读
本课是 鞋店购物对话，重点是一般过去时在对话中的运用（bought、had、were），以及 in fashion 这类固定说法。
¶ 1 · 一般过去时问答（句 7-10）
| 句子 | 语法点 |
|---|
| But my sister bought this pair last month. | 不规则 buy → bought；a pair of 表一双、一对 |
| Did she buy them here? | 过去时疑问句用 Did + 动词原形 |
| No, she bought them in the U.S. | 答语用过去式 bought |
| We had some shoes like those a month ago… | have → had；ago 与过去时连用，表「……以前」 |
¶ 2 · sorry 与 I'm afraid（句 6、12）
| 句子 | 语法点 |
|---|
| I'm sorry. We don't have any. | 缺货时的礼貌说法；any 后省略了 shoes |
| I'm afraid that I can't. | I'm afraid… 委婉地表示不能、恐怕不行 |
¶ 3 · 流行与款式（句 12-14）
| 句子 | 语法点 |
|---|
| They were in fashion last year and the year before last. | in fashion = 流行、时髦；反义是 out of fashion |
| But they're not in fashion this year. | 否定式 are not |
| These shoes are in fashion now. | these + 复数名词 + are |
¶ 4 · 穿着（句 15-16）
| 句子 | 语法点 |
|---|
| They look very uncomfortable. | un- 是否定前缀；look + 形容词 |
| But women always wear uncomfortable shoes! | wear 表穿着、戴着；过去式是 wore |
二固定搭配与重点词组
| 短语 | 用法与例句 |
|---|
| shoes like these | 像这样的鞋。like 在此是介词。 |
| a pair of shoes | 一双鞋。 |
| a month ago | 一个月前。ago 只与过去时连用。 |
| in fashion / out of fashion | 流行 / 不流行。 |
| I'm afraid that… | 恐怕……（委婉拒绝）。 |
| wear uncomfortable shoes | 穿不舒服的鞋。 |
三语法核心总结
- Did 后用动词原形，但回答要用过去式：Did she buy…? — No, she bought…
- ago 只与过去时连用：a month ago，不能与现在完成时同用。
- wear 强调穿着状态，put on 强调穿的动作。
- 本课生词 6 个全部嵌入课文句子，无遗漏。