第91课 Three Men in a Basket 深度语法精讲
课文主题：悬疑叙事与情报误会
语法核心：定语从句 + 进行时态 + 被动语态 + 情态推测
难度等级：★★★★☆ (中高级)
课文原文
Lesson 91 Three men in a basket 三人同篮
A pilot noticed a balloon which seemed to be making for a Royal Air Force Station nearby. He informed the station at once, but no one there was able to explain the mystery. The officer in the control tower was very angry when he heard the news, because balloons can be a great danger to aircraft. He said that someone might be spying on the station and the pilot was ordered to keep track of the strange object. The pilot managed to circle the balloon for some time. He could make out three men in a basket under it and one of them was holding field-glasses. When the balloon was over the station, the pilot saw one of the men taking photographs. Soon afterwards, the balloon began to descend and it landed near an airfield. The police were called in, but they could not arrest anyone, for the basket contained two Members of Parliament and the Commanding Officer of the station! As the Commanding Officer explained later, one half of the station did not know what the other half was doing!
一、词法分析 (Morphology)
1.1 核心词汇词类标注
名词 (Nouns)
| 词汇 | 词义 | 词类特征 | 语法要点 |
|---|---|---|---|
| pilot | 飞行员 | 可数名词 | 职业名词，可作主语/宾语 |
| balloon | 气球 | 可数名词 | 全文核心意象词 |
| station | 站点 | 可数名词 | 军事术语，此处指”空军基地” |
| mystery | 谜团 | 可数名词 | 抽象名词具体化 |
| officer | 军官 | 可数名词 | 复合词 commanding officer |
| aircraft | 飞机 | 集体名词 | 单复数同形 |
| danger | 危险 | 可数/不可数 | be a danger to 固定搭配 |
| field-glasses | 望远镜 | 复数名词 | 复合词，英式英语 |
| airfield | 飞机场 | 可数名词 | 合成词 (air + field) |
| basket | 篮子 | 可数名词 | 本课标题核心词 |
动词 (Verbs)
| 词汇 | 词义 | 词类 | 词形变化 | 语法功能 |
|---|---|---|---|---|
| notice | 注意到 | 及物动词 | noticed - noticing | 感官动词，可接宾从 |
| seem | 似乎 | 系动词 | seemed - seeming | seem to do 结构 |
| inform | 通知 | 及物动词 | informed - informing | 双宾语结构 |
| explain | 解释 | 及物动词 | explained - explaining | 接疑问词+不定式 |
| spy | 侦察 | 不及物动词 | spied - spying | spy on 短语动词 |
| track | 追踪 | 及物动词 | tracked - tracking | keep track of 短语 |
| circle | 盘旋 | 及物动词 | circled - circling | 可作名词/动词 |
| descend | 下降 | 不及物动词 | descended - descending | 正式用语 |
| arrest | 逮捕 | 及物动词 | arrested - arresting | 法律用语 |
| contain | 包含 | 及物动词 | contained - containing | 状态动词 |
形容词与副词
| 词汇 | 词性 | 比较级/最高级 | 语法功能 |
|---|---|---|---|
| nearby | 形容词/副词 | - | 可作后置定语 |
| angry | 形容词 | angrier - angriest | 表语形容词 |
| strange | 形容词 | stranger - strangest | 前置定语 |
| soon afterwards | 时间副词 | - | 句首时间状语 |
| later | 副词 | - | 后置时间状语 |
1.2 重要词形变化要点
1. make → made → made → making
├─ make for (走向)
├─ make out (辨认出)
└─ make sb. do (使某人做)
2. hold → held → held → holding
└─ was holding (过去进行时)
3. take → took → taken → taking
├─ take photographs (拍照)
└─ see sb. taking (see sb. doing)
4. spy → spied → spied → spying
└─ might be spying (情态+进行)
二、句法分析 (Syntax)
2.1 全文句型统计
| 句型类别 | 数量 | 占比 | 示例 |
|---|---|---|---|
| 简单句 | 3 | 25% | The police were called in. |
| 并列句 | 2 | 16.7% | …but no one there was able to explain… |
| 复合句-定语从句 | 2 | 16.7% | a balloon which seemed to be… |
| 复合句-宾语从句 | 3 | 25% | He said that someone might be spying… |
| 复合句-状语从句 | 2 | 16.7% | when he heard the news… |
| 总计 | 12 | 100% | - |
2.2 逐句成分分析
Sentence 1
A pilot noticed a balloon which seemed to be making for a Royal Air Force Station nearby.
主语: A pilot (名词短语)
谓语: noticed (及物动词，一般过去时)
宾语: a balloon which seemed to be making for a Royal Air Force Station nearby
└─ 中心词: a balloon
└─ 定语从句: which seemed to be making for a Royal Air Force Station nearby
├─ 关系代词: which (指代 balloon，作主语)
├─ 谓语: seemed (系动词)
└─ 表语/补足语: to be making for a Royal Air Force Station nearby
├─ to be making: 不定式进行式
├─ make for: 动词短语 (走向)
└─ a Royal Air Force Station nearby: 宾语
└─ nearby: 副词作后置定语修饰 Station
句法要点：
- 定语从句 (Attributive Clause)：which 引导限制性定语从句，修饰 balloon
- 不定式进行式 (Progressive Infinitive)：to be making 表示正在进行且与 seemed 同时发生的动作
- 动词短语 (Phrasal Verb)：make for = head toward / move toward
Sentence 2
He informed the station at once, but no one there was able to explain the mystery.
分句①: He informed the station at once
├─ 主语: He
├─ 谓语: informed (及物动词，一般过去时)
├─ 间接宾语: the station
└─ 状语: at once (时间状语，意为"立即")
并列连词: but (转折关系)
分句②: no one there was able to explain the mystery
├─ 主语: no one there (不定代词 + 副词后置定语)
├─ 谓语: was able to explain (半助动词 + 动词)
│ └─ was able to: 能够 (相当于 could，但更正式)
└─ 宾语: the mystery
句法要点：
- 并列句 (Compound Sentence)：but 连接两个对比分句
- 半助动词 (Semi-auxiliary)：be able to do 结构
Sentence 3
The officer in the control tower was very angry when he heard the news, because balloons can be a great danger to aircraft.
主句: The officer in the control tower was very angry
├─ 主语: The officer in the control tower
│ └─ in the control tower: 介词短语作后置定语
├─ 系动词: was
└─ 表语: very angry (程度副词 + 形容词)
时间状语从句: when he heard the news
├─ when: 从属连词
├─ 主语: he
├─ 谓语: heard (及物动词)
└─ 宾语: the news
原因状语从句: because balloons can be a great danger to aircraft
├─ because: 从属连词
├─ 主语: balloons
├─ 谓语: can be (情态动词 + 系动词)
├─ 表语: a great danger (名词短语)
└─ 状语: to aircraft (介词短语，表示对象)
句法要点：
- 主从复合句 (Complex Sentence)：主句 + when 时间从句 + because 原因从句
- 嵌套结构：原因从句解释主句状态的原因，时间从句限定主句发生的时间
- 情态动词 (Modal Verb)：can be 表示”可能是/能够是”
Sentence 4
He said that someone might be spying on the station and the pilot was ordered to keep track of the strange object.
主语: He
谓语: said (及物动词)
宾语从句①: that someone might be spying on the station
├─ that: 从属连词 (可省略)
├─ 主语: someone
├─ 谓语: might be spying (情态动词 + 进行式)
│ └─ might: 表示推测，"可能"
│ └─ be spying: 进行时态
└─ 状语: on the station (介词短语)
└─ spy on: 短语动词 (监视/侦察)
并列连词: and
分句②: the pilot was ordered to keep track of the strange object
├─ 主语: the pilot
├─ 谓语: was ordered (被动语态，一般过去时)
└─ 主语补足语/状语: to keep track of the strange object
└─ (be) ordered to do: 被命令做某事
└─ keep track of: 短语动词 (跟踪/掌握...的动态)
└─ the strange object: 宾语
└─ strange: 前置定语修饰 object
句法要点：
- 宾语从句 (Object Clause)：that 引导陈述句作 said 的宾语
- 情态进行式 (Modal Progressive)：might be spying 表示对正在进行的动作的推测
- 被动语态 (Passive Voice)：was ordered 表示”被命令”
Sentence 5
The pilot managed to circle the balloon for some time.
主语: The pilot
谓语: managed (不及物动词，一般过去时)
宾语: to circle the balloon for some time (不定式短语)
├─ manage to do: 设法做成某事 (强调结果)
├─ circle: 动词 (盘旋/环绕)
├─ the balloon: 宾语
└─ for some time: 时间状语 (持续一段时间)
句法要点：
- 动词 + 不定式：manage 后必须接带 to 的不定式
- 时间状语：for some time 表示动作持续的时间段
Sentence 6
He could make out three men in a basket under it and one of them was holding field-glasses.
分句①: He could make out three men in a basket under it
├─ 主语: He
├─ 谓语: could make out (情态动词 + 短语动词)
│ └─ make out: 辨认出/看清楚
├─ 宾语: three men
└─ 定语: in a basket under it (介词短语作后置定语)
├─ in a basket: 在篮子里
└─ under it: 在它(气球)下方
并列连词: and
分句②: one of them was holding field-glasses
├─ 主语: one of them ("他们中的一个")
├─ 谓语: was holding (过去进行时)
└─ 宾语: field-glasses (复数名词，望远镜)
句法要点：
- 短语动词 (Phrasal Verb)：make out = distinguish / see clearly
- 过去进行时 (Past Progressive)：was holding 表示过去某一时刻正在进行的动作
- 多重介词短语：in a basket under it 层层修饰，展示空间关系
Sentence 7
When the balloon was over the station, the pilot saw one of the men taking photographs.
时间状语从句: When the balloon was over the station
├─ when: 从属连词
├─ 主语: the balloon
├─ 系动词: was
└─ 表语: over the station (介词短语，"在...上方")
主句: the pilot saw one of the men taking photographs
├─ 主语: the pilot
├─ 谓语: saw (感官动词，一般过去时)
├─ 宾语: one of the men
└─ 宾语补足语: taking photographs (现在分词)
└─ see sb. doing sth.: 看见某人正在做某事
句法要点：
- 感官动词 + 现在分词：see sb. doing 强调动作正在进行
- 对比：see sb. do (看到全过程) vs see sb. doing (看到正在进行的片段)
Sentence 8
Soon afterwards, the balloon began to descend and it landed near an airfield.
状语: Soon afterwards (时间副词，"不久之后")
分句①: the balloon began to descend
├─ 主语: the balloon
├─ 谓语: began (不及物动词)
└─ 宾语: to descend (不定式)
└─ begin to do: 开始做某事
并列连词: and
分句②: it landed near an airfield
├─ 主语: it (指代 balloon)
├─ 谓语: landed (不及物动词，降落)
└─ 状语: near an airfield (地点状语)
句法要点：
- begin 的用法：begin to do (开始去做，有趋向性)
- ** descend vs land**：descend (下降过程) → land (着陆结果)
Sentence 9
The police were called in, but they could not arrest anyone, for the basket contained two Members of Parliament and the Commanding Officer of the station!
分句①: The police were called in
├─ 主语: The police (集合名词，复数概念)
├─ 谓语: were called in (被动语态)
└─ call in: 召来/叫来 (警察被召来)
并列连词: but (转折)
分句②: they could not arrest anyone
├─ 主语: they
├─ 谓语: could not arrest (情态否定)
└─ 宾语: anyone (不定代词，用于否定句)
原因连词: for (表示补充说明的原因，较正式)
原因分句③: the basket contained two Members of Parliament and the Commanding Officer of the station
├─ 主语: the basket
├─ 谓语: contained (状态动词，一般过去时)
└─ 宾语: two Members of Parliament and the Commanding Officer of the station
├─ Members of Parliament: 国会议员 (M.P.)
└─ the Commanding Officer of the station: 站长/基地指挥官
└─ Commanding Officer: 复合名词
句法要点：
- because vs for：
- because：直接原因，回答 why
- for：补充说明，提供额外信息，常放在句末
- 被动语态：were called in 警察被召来
- 专有名词：Members of Parliament (首字母大写，表示特定身份)
Sentence 10
As the Commanding Officer explained later, one half of the station did not know what the other half was doing !
方式/时间状语从句: As the Commanding Officer explained later
├─ as: "正如/当...时"
├─ 主语: the Commanding Officer
├─ 谓语: explained (及物动词)
└─ 状语: later (时间副词)
主句: one half of the station did not know what the other half was doing
├─ 主语: one half of the station
│ └─ one half: 一半
├─ 谓语: did not know (否定式)
└─ 宾语从句: what the other half was doing
├─ what: 连接代词 (作 doing 的宾语)
├─ 主语: the other half
├─ 谓语: was doing (过去进行时)
└─ 含义: 另一半在做什么
句法要点：
- 宾语从句 (Object Clause)：what 引导，作 know 的宾语
- 习语化表达：“one half…did not know what the other half was doing”
- 字面：一半人不知道另一半人在做什么
- 隐含：讽刺空军基地内部沟通不畅，左半部分不知道右半部分的活动
2.3 从句类型识别汇总
| 从句类型 | 引导词 | 所在句子 | 功能 |
|---|---|---|---|
| 定语从句 | which | Sentence 1 | 修饰 balloon |
| 时间状语从句 | when | Sentence 3 | 修饰 was angry |
| 原因状语从句 | because | Sentence 3 | 解释原因 |
| 宾语从句 | that | Sentence 4 | 作 said 的宾语 |
| 时间状语从句 | when | Sentence 7 | 修饰 saw |
| 原因状语从句 | for | Sentence 9 | 补充说明 |
| 宾语从句 | what | Sentence 10 | 作 know 的宾语 |
| 方式状语从句 | as | Sentence 10 | ”正如” |
三、功能语法分析 (Functional Grammar)
3.1 时态系统分析
时态分布统计
| 时态 | 数量 | 动词示例 | 功能 |
|---|---|---|---|
| 一般过去时 | 15 | noticed, informed, was, heard, said | 叙述过去事件 |
| 过去进行时 | 4 | was making, was holding, was doing | 描述进行中的动作 |
| 情态动词+原形 | 5 | could, might, can | 能力、推测、可能性 |
| 过去将来意义 | 1 | was to do | 计划/命令 |
时态配合详解
【时间轴分析】
过去某一时间点
│
├──→ [背景状态] was angry / was able (一般过去时，状态)
│
├──→ [正在发生] was making for / was holding / was doing
│ (过去进行时，进行中的动作)
│
├──→ [瞬间动作] noticed / heard / saw (一般过去时，瞬时)
│
└──→ [先后事件] began → landed → were called → explained
(一般过去时，事件链)
【核心时态配合原则】
1. 叙事主线：一般过去时推动情节发展
2. 背景描写：过去进行时营造场景画面感
3. 情态辅助：could/might 表示能力与推测
重点时态对比
| 时态组合 | 例句 | 功能 |
|---|---|---|
| 过去进行时 vs 一般过去时 | was making for vs noticed | 背景动作 vs 瞬间感知 |
| 情态+进行式 | might be spying | 对正在进行动作的推测 |
| 进行时作定语 | seemed to be making | 不定式进行式表进行 |
| 感官动词+doing | saw...taking | 强调动作片段 |
3.2 语态分析 (Voice)
被动语态使用统计
| 被动结构 | 例句 | 功能分析 |
|---|---|---|
| was ordered | the pilot was ordered to… | 受事者作主语，强调命令 |
| were called in | The police were called in | 动作承受者前置 |
| could not arrest | they could not arrest anyone | 主动形式，否定能力 |
语态转换练习
主动 → 被动
原句: He ordered the pilot to keep track...
被动: The pilot was ordered to keep track...
分析要点:
- 原句宾语 the pilot 变为主语
- 谓语 ordered → was ordered
- 主语 he 可省略或用 by him
- 不定式保留: to keep track
语态选择原则：
- 当不知道或不必提及动作执行者时 → 用被动
- 当强调受事者时 → 用被动
- 本课两处被动都符合”不必强调执行者”原则
3.3 情态动词系统
| 情态动词 | 例句 | 情态意义 | 四级考点 |
|---|---|---|---|
| might | someone might be spying | 推测 (可能性较小) | ★★★ 推测用法 |
| could | He could make out… | 能力 (过去) | ★★ 过去能力 |
| could not | could not arrest | 能力否定 | ★ 否定能力 |
| can | balloons can be a danger | 客观可能性 | ★★ 客观推断 |
might be spying 深度解析
结构: might + be + V-ing (情态动词 + 进行式)
功能: 对"过去正在进行"的动作进行推测
对比:
├─ may be spying (现在推测，可能性中等)
├─ might be spying (现在推测，可能性较小)
├─ may have spied (对过去的推测，已完成)
└─ might have been spying (对过去进行的推测)
语境: 军官猜测"有人可能正在侦察基地"(当时正在发生)
3.4 语气系统 (Mood)
| 语气类型 | 例句 | 功能 |
|---|---|---|
| 陈述语气 | 全文主体 | 客观叙述事件 |
| 感叹语气 | (无直接感叹句) | - |
| 间接引语 | He said that… | 转述他人话语 |
四、本课核心语法点精讲
4.1 定语从句专题
限制性定语从句
【课文原句】
a balloon which seemed to be making for a Royal Air Force Station nearby
【结构分解】
先行词: a balloon (物)
关系词: which (作主语)
从句: seemed to be making for...
【语法规则】
1. 先行词为物时，关系词可用 which/that
2. 关系词在从句中作主语时不可省略
3. 翻译时将从句译为定语: "一个似乎正飞向...的气球"
定语从句 vs 分词短语
| 结构 | 例句 | 特点 |
|---|---|---|
| 定语从句 | the officer who was in the tower | 完整从句，可接各种修饰 |
| 分词短语 | the officer in the tower | 简洁，仅表状态 |
课文示例：
the officer in the control tower(介词短语，简洁)a balloon which seemed to be...(定语从句，复杂动作)
4.2 进行时态专题
过去进行时的四大功能
1. 【背景设置】
The officer was angry when he heard...
(设置情绪背景)
2. 【动作持续】
one of them was holding field-glasses
(描述持续进行的动作)
3. 【不定式进行】
seemed to be making for...
(不定式内部的动作进行)
4. 【感官动词+doing】
saw one of the men taking photographs
(see sb. doing 强调动作片段)
感官动词结构对比
| 结构 | 含义 | 例句 |
|---|---|---|
| see sb. do | 看到全过程 | I saw him enter the room. |
| see sb. doing | 看到正在做 | I saw him entering the room. |
| see sb. done | 看到被… | I saw him surrounded. |
课文应用：
saw one of the men taking photographs= 看到正在拍照的瞬间
4.3 被动语态专题
被动语态构成
【一般过去时被动】
was/were + 过去分词
课文实例:
├─ was ordered (单数主语)
├─ were called in (复数主语)
└─ was heard (文中未出现但常见)
【带情态动词的被动】
could be + 过去分词
may be + 过去分词
课文实例:
├─ might be spying (情态+进行，非被动)
└─ can be a danger (情态+系表，非被动)
4.4 难句解析
难句 1：多重从句嵌套
The officer in the control tower was very angry when he heard the news, because balloons can be a great danger to aircraft.
【句子结构图】
主句 (was angry)
/ \
定语 时间从句 (when)
(介短) / \
主语 谓宾 原因从句 (because)
/ \
主语 系表结构
balloons can be a danger
|
状语 (to aircraft)
【层次分析】
第1层: The officer...was very angry (主句)
第2层: when he heard the news (时间状语从句)
第3层: because balloons can be... (原因状语从句修饰主句)
【翻译要点】
控制塔里的军官听到消息后非常生气，因为气球可能对飞机构成巨大威胁。
难句 2：宾语从句与并列结构
He said that someone might be spying on the station and the pilot was ordered to keep track of the strange object.
【歧义分析】
结构A: He said [that someone...] and [the pilot was ordered...]
└─ 他说了两件事 (两个并列宾语从句)
结构B: He said that [someone might...and the pilot was ordered...]
└─ 他说了一件事 (一个从句内含并列)
【正确理解】
根据上下文，应为结构A：
1. 他说有人可能正在侦察基地
2. (因此)飞行员被命令跟踪这个奇怪物体
【语法要点】
- 当 said 后接多个 that 从句时，第一个 that 不可省，后面的可省
- 本句第二个 that 省略，形成 and the pilot...
4.5 语法图谱
【第91课语法知识图谱】
┌─────────────────────────────────────┐
│ Three Men in a Basket │
│ 核心语法体系 │
└──────────────────┬──────────────────┘
│
┌──────────────┬───────────────┼───────────────┬──────────────┐
▼ ▼ ▼ ▼ ▼
┌─────────┐ ┌──────────┐ ┌──────────┐ ┌──────────┐ ┌──────────┐
│ 从句系统 │ │ 时态系统 │ │ 语态系统 │ │ 情态系统 │ │ 特殊结构 │
└────┬────┘ └────┬─────┘ └────┬─────┘ └────┬─────┘ └────┬─────┘
│ │ │ │ │
├─定语从句 ├─一般过去时 ├─被动语态 ├─might ├─see sb. doing
│ (which) (叙事主线) (was ordered) (推测) (感官结构)
│
├─时间状语从句 ├─过去进行时 ├─短语动词 ├─could ├─make for/out
│ (when) (背景描写) (call in) (能力) (动词短语)
│
├─原因状语从句 ├─不定式进行
│ (because/ (to be making ├─can
│ for) for) (客观可能)
│
└─宾语从句
(that/what)
五、四级考试关联
5.1 考点对应表
| 本课语法点 | 四级考点 | 题型 | 难度 |
|---|---|---|---|
| 定语从句 | 关系词选择 | 选词填空/改错 | ★★★ |
| 过去进行时 | 时态辨析 | 完形填空 | ★★ |
| 被动语态 | 语态转换 | 翻译/写作 | ★★★ |
| 情态动词推测 | might/could 区别 | 单项选择 | ★★★ |
| see sb. doing | 非谓语动词 | 语法填空 | ★★ |
| because/for | 原因连词辨析 | 完形填空 | ★★ |
5.2 四级真题链接
题型1：定语从句关系词选择
【模拟题】
A pilot noticed a balloon ______ seemed to be making for a station.
A. which B. who C. where D. when
【答案】A
【解析】先行词 balloon 是物，关系词在从句中作主语，用 which/that。
题型2：情态动词推测
【模拟题】
The officer thought that someone ______ be spying on the station.
A. must B. might C. should D. need
【答案】B
【解析】根据课文，军官只是猜测，might 表示可能性较小的推测。
must 表示肯定推测(一定)，与文中不确定语气不符。
题型3：被动语态
【模拟题】
The pilot ______ to keep track of the strange object.
A. ordered B. was ordered C. orders D. has ordered
【答案】B
【解析】飞行员是"被命令"，用被动语态 was ordered。
5.3 写作句型推荐
【悬疑叙事开头模板】
______ noticed a ______ which seemed to be ______.
仿写: A teacher noticed a student who seemed to be cheating in the exam.
【层层递进描写模板】
He could make out... and one of them was doing...
仿写: I could make out several figures in the dark and one of them was waving at me.
【讽刺结尾模板】
As ______ explained later, one half of ______ did not know what the other half was doing!
仿写: As the manager explained later, one department did not know what the other department was doing!
六、学习检测
6.1 快速自测
Q1: 句子 “A pilot noticed a balloon which seemed to be making for…” 中，which 在定语从句中充当什么成分？
点击查看答案
答案: 主语
解析: which 指代 balloon，在从句 “which seemed to be making…” 中作主语。
Q2: “might be spying” 是什么时态结构？
点击查看答案
答案: 情态动词 + 进行式 (Modal + Progressive)
解析: might 是情态动词，be spying 是现在分词，构成对正在进行的动作的推测。
Q3: “see sb. doing sth.” 与 “see sb. do sth.” 有什么区别？
点击查看答案
答案:
- see sb. doing: 看到动作正在进行（片段）
- see sb. do: 看到动作全过程
解析: 课文中 “saw one of the men taking photographs” 强调看到正在拍照的瞬间。
6.2 句子成分分析练习
请分析下面句子的成分：
The police were called in, but they could not arrest anyone, for the basket contained two Members of Parliament.
七、总结
本课语法重点回顾
| 排名 | 语法点 | 重要程度 | 掌握标准 |
|---|---|---|---|
| 1 | 定语从句 (which) | ★★★★★ | 能识别、能翻译、会选择关系词 |
| 2 | 过去进行时 | ★★★★☆ | 理解叙事中的背景功能 |
| 3 | 被动语态 | ★★★★☆ | 掌握 was/were + p.p. 结构 |
| 4 | 情态推测 | ★★★★☆ | might/could 表推测的用法 |
| 5 | see sb. doing | ★★★☆☆ | 感官动词后接 doing 的用法 |
| 6 | because/for 区别 | ★★★☆☆ | 理解两者在原因表达上的差异 |
语法学习建议
- 定语从句：重点练习关系词选择，特别是 which/that/who/whom/whose 的区别
- 时态配合：通过时间轴理解一般过去时与过去进行时的配合使用
- 语态转换：练习主动句与被动句的相互转换
- 情态动词：整理 can/could/may/might/must 表推测时的可能性程度差异
文档信息
- 课程：新概念英语第二册 Lesson 91
- 标题：Three Men in a Basket
- 分析类型：深度语法精讲
- 生成日期：2026-03-29
本课涉及的语法术语
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