一全文逐句语法解读
本课围绕 议论名人，重点是 must be（表有根据的推论）与 can't be（表不可能），以及 反意疑问句。
¶ 1 · must be 表推论（句 3、6、12、15）
| 句子 | 语法点 |
|---|
| It must be Karen Marsh, the actress. | 推论 must be 表根据事实所作的推论，译为“一定” |
| That must be Conrad Reeves. | 对现在情况的肯定推论 |
| he must be her fourth or fifth | must be 后接名词或数词，表判断 |
| she must be at least forty | must be + 数量，表推测的年龄 |
¶ 2 · can't be 表不可能（句 8）
| 句子 | 语法点 |
|---|
| It can't be. | must be 的否定式是 can't be，表“不可能” |
| I think you're right! | I think + 从句，表个人看法 |
| Let me have another look. | another 表“再一个、另一个” |
¶ 3 · 反意疑问句与年龄表达（句 11、13、14、18）
| 句子 | 语法点 |
|---|
| Isn't he her third husband? | 否定疑问句，表惊讶或求证 |
| Doesn't Karen Marsh look old! | 否定疑问句用作感叹，表“真……啊” |
| That was a long time ago, wasn't it? | 前肯后否的反意疑问句，寻求认同 |
二固定搭配与重点词组
| 短语 | 用法与例句 |
|---|
| must be | 一定是（根据事实的推论）。 |
| can't be | 不可能是。must be 的否定式。 |
| at least | 至少。 |
| read (read, read) | 通过阅读得知。I read she's twenty-nine. |
| look old | 显得老。look + 形容词，表“看起来……”。 |
| a long time ago | 很久以前。与一般过去时连用。 |
三语法核心总结
核心语法
must be / can't be 表推论
- must be 表根据事实所作的推论，译为“一定”；其否定式是 can't be（不可能）。
- 注意区分 could 表能力（I can't type this letter）与 can't be 表不可能。
- 否定疑问句可用来表惊讶或感叹：Doesn't Karen Marsh look old!
- 本课生词 5 个全部嵌入课文句子，无遗漏。