第65课 Jumbo versus the police 深度语法分析
课号：第65课（共96课）
标题：Jumbo versus the police（小象对警察）
核心语法重点：情态动词+完成式、分词作状语、分词作定语
难度等级：★★★☆（四级进阶）
课文原文
**Lesson 65: Jumbo versus the police 小象对警察**
**参考译文：**
去年圣诞节，马戏团老板吉米·盖茨决定带些礼物去儿童医院。他打扮成圣诞老人，由六位漂亮姑娘组成的"仪仗队"陪同，骑着一头名叫江伯的小象，沿着城市的主街出发了。他本该知道警察绝不会允许这种事情。一名警察走近吉米，告诉他本该走侧街，因为江伯阻碍了交通。尽管吉米同意马上离开，江伯却拒绝移动。十五名警察不得不使劲推才把它弄离主街。警察们经历了一段困难时期，但他们觉得非常有趣。"江伯一定有好几吨重，"一名警察事后说，"所以幸好我们不用抬它。当然，我们应该逮捕它，但因为它表现良好，这次我们就放过它。"
Last Christmas, the circus owner, Jimmy Gates, decided to take some presents to a children’s hospital. Dressed up as Father Christmas and accompanied by a ‘guard of honour’ of six pretty girls, he set off down the main street of the city riding a baby elephant called Jumbo. He should have known that the police would never allow this sort of thing. A policeman approached Jimmy and told him he ought to have gone along a side-street as Jumbo was holding up the traffic. Though Jimmy agreed to go at once, Jumbo refused to move. Fifteen policemen had to push very hard to get him off the main street. The police had a difficult time, but they were most amused. ‘Jumbo must weigh a few tons,’ said a policeman afterwards, ‘so it was fortunate that we didn’t have to carry him. Of course, we should arrest him, but as he has a good record, we shall let him off this time.‘
本课涉及的语法术语
一、词法分析 (Morphology)
1.1 核心词汇词类标注
| 词汇 | 音标 | 词性 | 本课含义 | 词形变化 |
|---|---|---|---|---|
| versus | /ˈvɜːsəs/ | prep. | 对；对抗（缩写 vs.） | — |
| circus | /ˈsɜːkəs/ | n. | 马戏团 | circuses (复数) |
| owner | /ˈəʊnə(r)/ | n. | 所有者；老板 | owners (复数) |
| dress up | /dres ʌp/ | v. phr. | 打扮；装扮 | dressed up (过去式/过去分词) |
| accompany | /əˈkʌmpəni/ | v. | 陪同；伴随 | accompanies (三单), accompanied (过去式) |
| guard | /ɡɑːd/ | n./v. | 护卫；警卫 | guards (复数/三单) |
| honour | /ˈɒnə(r)/ | n. | 荣誉；荣幸 | honours (复数) |
| set off | /set ɒf/ | v. phr. | 出发；启程 | set off (过去式/过去分词) |
| ought to | /ˈɔːt tuː/ | modal. | 应该（表义务/建议） | — |
| hold up | /həʊld ʌp/ | v. phr. | 阻挡；延误 | held up (过去式/过去分词) |
| refuse | /rɪˈfjuːz/ | v. | 拒绝 | refuses (三单), refused (过去式) |
| arrest | /əˈrest/ | v./n. | 逮捕；拘留 | arrests (三单/复数), arrested (过去式) |
| record | /ˈrekɔːd/ (n.) /rɪˈkɔːd/ (v.) | n./v. | 记录；履历 | records (复数/三单) |
| let off | /let ɒf/ | v. phr. | 放过；宽恕 | let off (过去式/过去分词) |
1.2 重点词汇深度解析
1.2.1 versus —— 介词的对抗含义
词源与用法：
versus ← 拉丁语 "转向、对抗"
常见形式：A versus B = A vs. B（A对B）
本课语境：
- Jumbo versus the police = 小象与警察的对抗
- 标题使用 versus 暗示了一种戏剧性的冲突场景
常见搭配：
| 搭配 | 含义 | 例句 |
|---|---|---|
| China versus Japan | 中国对日本 | a match between China versus Japan |
| plaintiff versus defendant | 原告对被告 | the case of Smith versus Jones |
1.2.2 dress up —— 动词短语的多层含义
词义层级：
dress up
├── 1. 盛装打扮（特殊场合）
│ └── She dressed up for the wedding.
├── 2. 装扮成...（伪装/角色扮演）
│ └── He dressed up as Santa Claus. ← 本课用法
└── 3. 粉饰；美化（贬义）
└── Don't dress up the facts.
本课用法：
Dressed up as Father Christmas（打扮成圣诞老人）
- dress up as + 角色 = 装扮成某角色
- 过去分词短语作伴随状语，表示与主句动作同时发生的状态
1.2.3 accompany —— 及物动词的用法
句型结构：
accompany + 人/物 = 陪同/伴随...
accompany + 人 + on/at + 乐器 = 为某人伴奏
本课用法：
accompanied by a ‘guard of honour’（由仪仗队陪同）
- 被动语态：be accompanied by = 由…陪同
- 过去分词短语作伴随状语
词族扩展：
accompany (v.) 陪同
↓
accompaniment (n.) 伴奏；伴随物
↓
accompanist (n.) 伴奏者
1.2.4 guard of honour —— 固定短语
含义解析：
guard of honour = 仪仗队；荣誉卫队
├── guard (n.) = 卫兵；警卫
├── of = 表示性质/用途
└── honour (n.) = 荣誉；敬意
字面：为表示荣誉而设的卫队
实际：列队欢迎或致敬的队伍
本课语境：
- 六个漂亮姑娘组成”仪仗队”，带有幽默夸张的色彩
- 增添了节日喜庆和戏剧性的氛围
1.2.5 ought to —— 情态动词的特殊性
语法特征：
oght to 的用法特点：
1. 情态动词，但后接带to的不定式
2. 无时态和人称变化
3. 否定式：ought not to / oughtn't to
4. 疑问式：Ought he to go?
含义对比：
| 情态动词 | 含义侧重 | 语气 |
|---|---|---|
| ought to | 道义/责任上的应该 | 较强 |
| should | 建议/义务上的应该 | 中等 |
| had better | 劝告/警告 | 较强 |
本课用法：
he ought to have gone along a side-street（他本该走侧街）
- ought to have done = 本该做而没做（责备/遗憾）
1.2.6 hold up —— 多义动词短语
含义辨析：
hold up
├── 1. 举起；支撑
│ └── Hold up your hands.
├── 2. 阻挡；延误 ← 本课用法
│ └── The accident held up traffic.
├── 3. 抢劫
│ └── The bank was held up yesterday.
└── 4. 经受住；维持
└── The theory holds up well.
本课用法：
Jumbo was holding up the traffic（江伯阻碍交通）
- 过去进行时，表示过去某时刻正在进行的动作
- 大象体积大，“阻挡”交通十分形象
1.2.7 refuse —— 拒绝的精确表达
词义与搭配：
refuse + to do = 拒绝做某事
refuse + sth = 拒绝某物
本课用法：
Jumbo refused to move（江伯拒绝移动）
- refuse to do 结构
- 拟人化手法，赋予大象人的意志
近义词辨析：
| 词汇 | 含义 | 例句 |
|---|---|---|
| refuse | 坚决拒绝 | He refused to answer. |
| reject | 明确拒绝（建议/申请） | She rejected his proposal. |
| decline | 婉言谢绝 | He declined the invitation. |
1.2.8 arrest —— 法律用语
词性与含义：
arrest
├── v. 逮捕；拘留
│ └── The police arrested the suspect.
└── n. 逮捕
└── under arrest = 被逮捕
本课用法：
we should arrest him（我们应该逮捕它）
- 警察的幽默表达——把大象当作人来看待
- 为后文的”let him off”（放过它）铺垫
1.2.9 record —— 多义词的语境含义
发音与含义：
record
├── /ˈrekɔːd/ (n.) 记录；履历；唱片
│ └── have a good record = 表现良好/记录良好
└── /rɪˈkɔːd/ (v.) 记录；录制
└── record a song
本课用法：
he has a good record（它表现良好/无不良记录）
- 名词用法，/ˈrekɔːd/
- 法律/行政用语，指”履历、记录”
- a good record = 无犯罪记录/表现良好
1.3 构词法分析
1.3.1 派生词（Derivation）
| 词根 | 派生词 | 词缀 | 词性 | 含义 |
|---|---|---|---|---|
| own | owner | -er | n. | 所有者 |
| dress | dressed | -ed | adj. | 穿着…的 |
| accompany | accompanied | -ed | adj. | 被陪同的 |
| fortune | fortunate | -ate | adj. | 幸运的 |
| amuse | amused | -ed | adj. | 感到有趣的 |
| amuse | amusement | -ment | n. | 娱乐；乐趣 |
1.3.2 合成词（Compounding）
| 合成词 | 组成成分 | 词性 | 含义 |
|---|---|---|---|
| circus owner | circus + owner | n. | 马戏团老板 |
| children’s hospital | children + ‘s + hospital | n. | 儿童医院 |
| Father Christmas | Father + Christmas | n. | 圣诞老人 |
| guard of honour | guard + of + honour | n. | 仪仗队 |
| side-street | side + street | n. | 侧街；小巷 |
| main street | main + street | n. | 主街；大街 |
1.3.3 动词不规则变化
| 原形 | 过去式 | 过去分词 | 现在分词 | 本课出现 |
|---|---|---|---|---|
| dress | dressed | dressed | dressing | dressed up |
| set | set | set | setting | set off |
| hold | held | held | holding | holding up |
| get | got | got/gotten | getting | get him off |
| let | let | let | letting | let him off |
二、句法分析 (Syntax)
2.1 全文句型统计
| 句型类别 | 数量 | 占比 | 例句编号 |
|---|---|---|---|
| 简单句 | 3 | 25% | S2, S5, S7 |
| 并列句 | 2 | 16.7% | S6, S8 |
| 复合句（含从句） | 7 | 58.3% | S1, S3, S4, S9, S10, S11 |
| 总计 | 12 | 100% | — |
2.2 逐句成分分析
S1: 开篇背景句
Last Christmas, the circus owner, Jimmy Gates, decided to take some presents to a children’s hospital.
句子结构：简单句（含同位语）
时间状语：
Last Christmas
└─ 去年圣诞节
主语：
the circus owner, Jimmy Gates,
│ 同位语结构：Jimmy Gates 是 circus owner 的同位语
└─ 马戏团老板吉米·盖茨
谓语：
decided
└─ 决定（一般过去时）
宾语（不定式短语）：
to take some presents to a children's hospital
│ to take = 带
│ some presents = 一些礼物（直接宾语）
│ to a children's hospital = 去儿童医院（地点状语）
└─ 带些礼物去儿童医院
S2: 描写出场（经典分词结构句）
Dressed up as Father Christmas and accompanied by a ‘guard of honour’ of six pretty girls, he set off down the main street of the city riding a baby elephant called Jumbo.
句子结构：简单句（含多个分词短语作状语/定语）
【状语部分】过去分词短语作伴随状语：
Dressed up as Father Christmas
│ Dressed up = 过去分词，表状态
│ as Father Christmas = 介词短语作状语
└─ 打扮成圣诞老人
and accompanied by a 'guard of honour' of six pretty girls
│ accompanied = 过去分词，表被动
│ by a 'guard of honour' = 施事状语
│ of six pretty girls = 介词短语作定语，修饰 guard
└─ 由六位漂亮姑娘组成的"仪仗队"陪同
【主句】
主语：he（他）
谓语：set off（出发）
│ └─ 动词短语，一般过去时
状语：
down the main street of the city
│ down = 沿着
│ the main street = 主街
│ of the city = 介词短语作定语
└─ 沿着城市的主街
【状语部分】现在分词短语作伴随状语：
riding a baby elephant called Jumbo
│ riding = 现在分词，表主动/进行
│ a baby elephant = 骑的对象
│ called Jumbo = 过去分词短语作后置定语，修饰 elephant
│ called = 被叫做
│ Jumbo = 象的名字
└─ 骑着一头名叫江伯的小象
本句涉及语法术语：过去分词作状语 | 现在分词作状语 | 过去分词作定语 | 介词短语
S3: 虚拟责备（should have done）
He should have known that the police would never allow this sort of thing.
句子结构：主从复合句（含宾语从句）
主句：
He │ should have known
主语│ 谓语（情态动词+完成式）
│ │
│ ├─ should have known = 本该知道（实际不知道）
│ └─ 表示对过去行为的责备/遗憾
└─ 他本该知道
宾语从句：
that │ the police │ would never allow │ this sort of thing
连词 │ 主语 │ 谓语（过去将来时）│ 宾语
│ │
│ ├─ would allow = 会允许
│ ├─ never = 绝不（否定副词）
│ └─ 从过去看将来
└─ 警察绝不会允许这种事情
语法要点：
- should have done = 本该做而没做，表责备或遗憾
- would never allow = 过去将来时，从过去视角看未来
- this sort of thing = 这种事情（sort = 种类）
本句涉及语法术语：宾语从句 | 情态动词完成式 | 过去将来时
S4: 警察干预（ought to have done）
A policeman approached Jimmy and told him he ought to have gone along a side-street as Jumbo was holding up the traffic.
句子结构：并列复合句（and连接）+ 多层从句
【分句1】
A policeman │ approached │ Jimmy
主语 │ 谓语 │ 宾语
└─ 一名警察走近吉米
【分句2】
and │ told │ him │ [宾语从句]
连词│ 谓语 │ 间宾│ 直宾（省略that）
└─ 告诉他...
【宾语从句】
(that) │ he │ ought to have gone │ along a side-street │ [原因状语从句]
连词 │ 主 │ 谓语 │ 地点状语 │
│ │
│ ├─ ought to have gone = 本该走（实际没走）
│ ├─ 比 should have done 语气更强
│ └─ 表责备
└─ 他本该走侧街
【原因状语从句】
as │ Jumbo │ was holding up │ the traffic
连词│ 主语 │ 谓语（过去进行时）│ 宾语
│ │
│ ├─ was holding up = 正在阻挡
│ └─ hold up = 阻挡（动词短语）
└─ 因为江伯正在阻碍交通
语法要点：
- ought to have gone = 本该走而没走，与 should have done 同义但语气更强
- as 引导原因状语从句 = because/since（因为）
- 过去进行时 was holding up 强调动作正在进行
本句涉及语法术语：宾语从句 | 原因状语从句 | 过去进行时 | 情态动词完成式
S5: 小象固执（转折）
Though Jimmy agreed to go at once, Jumbo refused to move.
句子结构：主从复合句（含让步状语从句）
【让步状语从句】
Though │ Jimmy │ agreed │ to go at once
连词 │ 主语 │ 谓语 │ 宾语（不定式）
│ │
│ ├─ agree to do = 同意做某事
│ └─ at once = 立刻，马上
└─ 尽管吉米同意马上离开
【主句】
Jumbo │ refused │ to move
主语 │ 谓语 │ 宾语（不定式）
│ │
│ ├─ refuse to do = 拒绝做某事
│ └─ 不定式作宾语
└─ 江伯却拒绝移动
语法要点：
- Though = Although，引导让步状语从句，“尽管/虽然”
- agree to do 与 refuse to do 形成对比，体现主从句的转折关系
- 主从句主语不同（Jimmy vs. Jumbo），动作态度相反
S6: 警察合力（简单句+不定式表目的）
Fifteen policemen had to push very hard to get him off the main street.
句子结构：简单句
主语：
Fifteen policemen
└─ 十五名警察
谓语：
had to push
│ ├─ have to 的过去式，表"不得不"
│ └─ 含有客观强制意味
└─ 不得不推
状语：
very hard
└─ 非常用力地
目的状语（不定式）：
to get him off the main street
│ ├─ get off = 使...离开
│ ├─ him 指代 Jumbo
│ └─ the main street = 主街
└─ 为了把他弄离主街
语法要点：
- had to = have to 的过去式，表客观 necessity（不得不）
- 不定式作目的状语 to get… 表示 push 的目的
- get + 宾语 + off = 使…离开
S7: 警察感受（转折）
The police had a difficult time, but they were most amused.
句子结构：并列句（but连接表转折）
【分句1】
The police │ had │ a difficult time
主语 │ 谓语│ 宾语
│ │
│ ├─ police 集体名词，表复数
│ ├─ have a difficult time = 经历困难时期
│ └─ difficult = 艰难的
└─ 警察们经历了一段困难时期
【分句2】
but │ they │ were │ most amused
连词│ 主语 │ 系动词│ 表语
│ │
│ ├─ most = very，非常（程度副词）
│ ├─ amused = 感到有趣的（过去分词作形容词）
│ └─ 过去分词表被动感受
└─ 但他们觉得非常有趣
语法要点：
- The police 集体名词，谓语用复数
- most = very，非最高级用法
- amused 过去分词作表语，表示主语的感受
S8-S11: 警察对话（直接引语）
‘Jumbo must weigh a few tons,’ said a policeman afterwards, ‘so it was fortunate that we didn’t have to carry him. Of course, we should arrest him, but as he has a good record, we shall let him off this time.’
句子结构：直接引语（多个句子组合）
【S8】推测重量（must表推测）
Jumbo │ must weigh │ a few tons
主语 │ 谓语 │ 宾语
│ │
│ ├─ must weigh = 一定重（肯定推测）
│ ├─ must + 动词原形 = 对现在情况的肯定推测
│ └─ "一定/必定"
└─ 江伯一定有好几吨重
【插入语】
said a policeman afterwards
└─ 一名警察事后说（倒装结构）
【S9】庆幸结果（so结果状语从句）
so │ it │ was │ fortunate │ [主语从句]
连词│ 形式主│ 系 │ 表语 │ 真正主语
│ │
│ └─ fortunate = 幸运的
└─ 所以...是幸运的
【主语从句】
that │ we │ didn't have to │ carry him
连词 │ 主 │ 谓语 │ 宾语
│ │
│ ├─ didn't have to = 不必（过去式）
│ └─ have to 的否定 = 不必
└─ 我们不必抬它
【S10-S11】警察的幽默决定
Of course, we should arrest him, but as he has a good record, we shall let him off this time.
【分句1】
Of course │ we │ should arrest │ him
插入语 │ 主 │ 谓语 │ 宾语
│ │
│ ├─ should = 应该（道义上的义务）
│ └─ 按理说应该...
└─ 当然，我们应该逮捕它
【分句2】but + 原因状语从句
but │ [原因状语从句] │ we │ shall let him off │ this time
连词│ │ 主 │ 谓语 │ 时间状语
│ │
│ ├─ let off = 放过；宽恕
│ └─ shall = will（英式用法）
└─ 但这次我们就放过它
【原因状语从句】
as │ he │ has │ a good record
连词│ 主 │ 谓 │ 宾语
│ │
│ ├─ has = 有（一般现在时）
│ └─ a good record = 良好的记录/表现
└─ 因为它表现良好
语法要点：
- must weigh = 对现在的肯定推测，“一定重…”
- it was fortunate that… = it 作形式主语，that从句是真正主语
- should arrest vs shall let off = 应该逮捕 vs 将要放过
- as 引导原因状语从句
本句涉及语法术语：情态动词表推测 | 主语从句 | 原因状语从句 | 形式主语
三、功能语法分析 (Functional Grammar)
3.1 过去分词作伴随状语
结构公式
过去分词短语 + 主句
= 主语 + be + 过去分词（省略be动词）+ 主句
本课例句
Dressed up as Father Christmas and accompanied by a 'guard of honour'...
= He was dressed up as Father Christmas and (he was) accompanied by...
（他打扮成圣诞老人，被...陪同）
语法特征
| 特征 | 说明 | 本课体现 |
|---|---|---|
| 逻辑主语 | 与主句主语一致 | he |
| 语态 | 表被动或完成状态 | dressed（被打扮）/ accompanied（被陪同） |
| 时间 | 与主句动作同时发生 | set off 时已经 dressed |
| 功能 | 描述主语的伴随状态 | 出场时的装扮 |
同类结构扩展
Seated at the back of the hall, I couldn't hear clearly.
（坐在大厅后排，我听不清楚。）
Trapped in the traffic jam, we were late for the meeting.
（被困在交通堵塞中，我们开会迟到了。）
3.2 现在分词作伴随状语
结构公式
主句 + 现在分词短语
= 主句 + and + 主语 + be doing（省略并列结构）
本课例句
...he set off... riding a baby elephant called Jumbo.
= ...he set off... and he was riding a baby elephant...
（...他出发... 骑着一头小象...）
语法特征
| 特征 | 说明 | 本课体现 |
|---|---|---|
| 逻辑主语 | 与主句主语一致 | he |
| 语态 | 表主动或进行 | riding（主动骑） |
| 时间 | 与主句动作同时发生 | set off 的同时 riding |
| 功能 | 描述主语的伴随动作 | 骑着大象前进 |
现在分词 vs 过去分词作状语
| 对比项 | 现在分词 | 过去分词 |
|---|---|---|
| 语态 | 主动 | 被动 |
| 时间 | 进行 | 完成/状态 |
| 本课例 | riding | dressed, accompanied |
3.3 过去分词作后置定语
结构公式
名词 + 过去分词短语
= 名词 + 定语从句（被动语态）的省略
本课例句
a baby elephant called Jumbo
= a baby elephant (which was) called Jumbo
（一头被叫做江伯的小象）
语法要点
- called = named，意为”被叫做/名叫”
- 过去分词短语紧跟被修饰的名词
- 相当于定语从句 which was called Jumbo 的省略形式
同类结构
The book written by Dickens is famous.
= The book (which was) written by Dickens...
（狄更斯写的书很有名。）
The man injured in the accident was taken to hospital.
= The man (who was) injured in the accident...
（事故中受伤的人被送往医院。）
3.4 should have done —— 本该做而没做
结构公式
should have + 过去分词
= 本该做（实际未做）→ 表责备/遗憾
本课例句
He should have known that...
他本该知道...（实际却不知道）
语义层次
should have done 的语义：
├── 1. 责备/批评（最常见）
│ └── You should have told me earlier.
│ （你本该早点告诉我。——隐含：你告诉得太晚了）
├── 2. 遗憾/惋惜
│ └── I should have studied harder.
│ （我本应该更努力学习的。——隐含：现在后悔了）
└── 3. 惊讶/出乎意料
└── It should have been obvious.
（这本该是显而易见的。——隐含：居然不明显）
与其他形式的对比
| 形式 | 含义 | 例句 |
|---|---|---|
| should do | 应该做（现在/将来） | You should study. |
| should have done | 本该做（过去未做） | You should have studied. |
| shouldn’t have done | 本不该做（却做了） | You shouldn’t have said that. |
3.5 ought to have done —— 道义上的本该做
结构公式
oght to have + 过去分词
= 道义上本该做（实际未做）
≈ should have done（语气更强）
本课例句
he ought to have gone along a side-street
他本该走侧街（实际走了主街）
should have done vs ought to have done
| 对比项 | should have done | ought to have done |
|---|---|---|
| 语气 | 建议/预期 | 道义/责任（更强） |
| 语境 | 一般建议 | 强调义务 |
| 本课 | 他本该知道 | 他本该走侧街 |
注意：ought to 的否定和疑问形式
否定：ought not to have done / oughtn't to have done
疑问：Ought he to have done that?
3.6 as 引导原因状语从句
结构公式
as + 从句 = because/since + 从句（因为...）
本课例句
...as Jumbo was holding up the traffic.
...因为江伯正在阻碍交通。
...as he has a good record, we shall let him off...
...因为他表现良好，我们就放过他...
as/because/since/for 的区别
| 连词 | 语气 | 位置 | 例句 |
|---|---|---|---|
| because | 最强（回答why） | 主句前/后 | Because it rained, we stayed home. |
| since | 中等（已知原因） | 主句前 | Since you’re busy, I’ll leave. |
| as | 较弱（附带说明） | 主句前/后 | As it was late, we went home. |
| for | 最弱（补充解释） | 主句后 | We stayed, for it was interesting. |
本课两处 as 对比
| 位置 | 例句 | 功能 |
|---|---|---|
| S4 | as Jumbo was holding up the traffic | 解释为什么要走侧街 |
| S11 | as he has a good record | 解释为什么放过它 |
3.7 though 引导让步状语从句
结构公式
Though/Although + 从句, + 主句
= "虽然/尽管...但是..."（注意：不可与but连用）
本课例句
Though Jimmy agreed to go at once, Jumbo refused to move.
尽管吉米同意马上离开，江伯却拒绝移动。
though vs although vs even though
| 连词 | 语气 | 例句 |
|---|---|---|
| though | 一般（可倒装） | Though tired, he continued. |
| although | 稍正式 | Although it rained, we went. |
| even though | 强调（即使） | Even though it rained, we went. |
让步状语从句的倒装（强调式）
Though Jimmy agreed to go... = Tired though/as he was...
（形容词 + though + 主语 + 系动词）
例：Hard as he tried, he failed.
（尽管他很努力，还是失败了。）
3.8 must 表推测
结构公式
肯定推测：must + 动词原形 = 一定/必定...
否定推测：can't/couldn't + 动词原形 = 不可能...
本课例句
Jumbo must weigh a few tons.
江伯一定有好几吨重。
分析：
├── must = 肯定推测，"一定/必定"
├── weigh = 动词原形（重...）
└── 说话者根据大象的体型做出的推断
must 表推测 vs must 表必须
| 用法 | 结构 | 例句 | 含义 |
|---|---|---|---|
| 推测 | must + do | He must be tired. | 他一定累了。（推测） |
| 必须 | must + do | You must go. | 你必须走。（义务） |
| 推测（过去） | must have done | He must have left. | 他一定已经走了。 |
| 必须（过去） | had to do | He had to go. | 他不得不走。 |
推测的强弱程度
肯定推测（由强到弱）：
must > should/ought to > may > might > could
否定推测（由强到弱）：
can't/couldn't > may not > might not
四、语法术语索引
本课涉及的核心语法术语：
| 术语 | 英文 | 本课应用 |
|---|---|---|
| 简单句 | Simple Sentence | S1, S5, S6 |
| 并列句 | Compound Sentence | S6, S7 |
| 主从复合句 | Complex Sentence | S3, S4, S5 |
| 同位语 | Appositive | Jimmy Gates |
| 宾语从句 | Object Clause | S3, S4 |
| 原因状语从句 | Adverbial Clause of Cause | S4, S11 |
| 让步状语从句 | Adverbial Clause of Concession | S5 |
| 过去分词作状语 | Past Participle as Adverbial | dressed up, accompanied |
| 现在分词作状语 | Present Participle as Adverbial | riding |
| 过去分词作定语 | Past Participle as Attribute | called Jumbo |
| 不定式短语 | Infinitive Phrase | to take, to go, to move |
| 介词短语 | Prepositional Phrase | as Father Christmas, by a guard |
| 情态动词完成式 | Modal Perfect | should have known, ought to have gone |
| 情态动词表推测 | Modal of Deduction | must weigh |
| 过去进行时 | Past Continuous | was holding up |
| 过去将来时 | Past Future | would never allow |
| 形式主语 | Formal Subject | it was fortunate that… |
| 主语从句 | Subject Clause | that we didn’t have to… |
五、课文语法脉络图
第65课语法结构脉络
│
├── 开场描写（分词结构密集区）
│ ├── 过去分词作状语：Dressed up as..., accompanied by...
│ ├── 现在分词作状语：riding a baby elephant
│ └── 过去分词作定语：called Jumbo
│
├── 情节发展（情态动词完成式）
│ ├── should have done（责备）：should have known
│ └── ought to have done（更强责备）：ought to have gone
│
├── 冲突升级（从句运用）
│ ├── as原因从句：as Jumbo was holding up...
│ └── though让步从句：Though Jimmy agreed...
│
└── 结局收束（推测与决定）
├── must表推测：must weigh
├── it形式主语：it was fortunate that...
└── as原因从句：as he has a good record
六、课后语法练习
练习一：分词结构填空
用所给动词的适当形式填空：
- ________ (dress) in white, she attended the wedding ceremony.
- The man ________ (call) John is my neighbor.
- She sat by the window, ________ (read) a novel.
- ________ (accompany) by his friends, he felt more confident.
练习二：情态动词完成式
选择 should have done, shouldn’t have done, ought to have done 填空：
- You ____________ (tell) me the truth earlier.
- She ____________ (say) such rude words. (否定)
- He ____________ (arrive) on time, but he was late.
练习三：从句识别
判断下列句子中划线部分的从句类型：
- He stopped as he saw the police.
- Though it was raining, we went out.
- I believe that he is honest.
参考答案：
练习一：1. Dressed 2. called 3. reading 4. Accompanied
练习二：1. should have told / ought to have told 2. shouldn’t have said 3. should have arrived / ought to have arrived
练习三：1. 原因状语从句 2. 让步状语从句 3. 宾语从句