一全文逐句语法解读
本课围绕 买电视机，重点是 多音节形容词的比较级与最高级（more / less expensive，the most expensive）以及 not as…as 结构。
¶ 1 · more / less 构成比较级（句 5、9）
| 句子 | 语法点 |
|---|
| This model's less expensive than that one. | 比较级 多音节词用 less/more + 原级 |
| The other model's more expensive | more + 形容词原级，与 less 相对 |
| it's not as good as the expensive one | not as…as 表“不如……” |
¶ 2 · the most 构成最高级（句 2）
| 句子 | 语法点 |
|---|
| It's the most expensive model in the shop. | the most + 形容词原级，表“最……” |
| the most expensive model in the shop | 最高级后常用 in/of 短语限定范围 |
| It costs five hundred pounds. | cost 的过去式、过去分词同形（cost, cost） |
¶ 3 · 付得起与分期付款（句 4、10、12）
| 句子 | 语法点 |
|---|
| We can't afford all that money. | afford 常与 can / can't 连用，表“付得起/付不起” |
| Can we buy it on instalments? | on instalments = 分期付款 |
| pay a deposit of thirty pounds | pay a deposit of + 金额，表“付……定金” |
二固定搭配与重点词组
| 短语 | 用法与例句 |
|---|
| be too expensive for sb. | 对某人来说太贵。 |
| can / can't afford | 付得起 / 付不起。 |
| on instalments | 分期付款。 |
| pay a deposit of + 金额 | 付……定金。 |
| not as … as | 不如……。It's not as good as the expensive one. |
| be worth the money | 值这个钱。 |
三语法核心总结
核心语法
more/less/the most 比较等级
- 大多数两个以上音节的形容词用 more / less 构成比较级，用 most / least 构成最高级。
- not as…as 可用来进行比较，表“不如……”。
- afford 常与 can / can't 连用；on instalments 表分期付款。
- 本课生词 6 个全部嵌入课文句子，无遗漏。