🔍 Mad or not? 是不是疯了？

新概念英语第二册 Lesson 21 · 语法精读与固定搭配分类

NCE Book 2 · Lesson 21（课本印刷页 92-95）· 4 个生词和短语 · 课文 9 句

一全文逐句语法解读

本课是「机场噪音逼人」的抱怨短文。语言点集中在 被动语态的多个时态（can be heard / was built / must have been driven / will be knocked down / have been offered）、情态动词的被动语态，以及 drive sb. mad / come into use / be determined to do 这类固定短语。

¶ 1 · 飞机与机场（句 1-4）

句子	语法点
Aeroplanes are slowly driving me mad.	drive sb. mad 把某人逼疯 · 用现在进行时表示持续不断的影响
… passing planes can be heard night and day.	情态动词的被动语态 can be + 过去分词 · night and day 日日夜夜
The airport was built years ago, but for some reason it could not be used then.	was built 是一般过去时的被动语态 · for some reason 由于某种原因

¶ 2 · 噪音的后果（句 5-7）

句子	语法点
Over a hundred people must have been driven away from their homes by the noise.	must have been + 过去分词对过去情况的肯定推测（被动）
I am one of the few people left.	one of the + 复数名词，谓语用单数 · left 是 leave 的过去分词作后置定语
Sometimes I think this house will be knocked down by a passing plane.	will be + 过去分词是一般将来时的被动语态 · knock down 撞倒、拆除

¶ 3 · 我的决定（句 8-9）

句子	语法点
I have been offered a large sum of money to go away, but I am determined to stay here.	现在完成时的被动语态 have been offered · be determined to do sth. 决心做某事
Everybody says I must be mad and they are probably right.	must be 表推测「一定」· probably 是副词，表示「很有可能」

二固定搭配与重点词组

短语	用法与例句
drive sb. mad	把某人逼疯。
night and day	日日夜夜，日夜不停。
for some reason	由于某种原因。
come into use	开始使用，启用。
be determined to do sth.	决心做某事。

三语法核心总结

被动语态各时态

is done／was done／will be done／has been done

情态动词的被动

can be heard · must have been driven

one of the + 复数

one of the few people left，谓语用单数

固定短语

drive sb. mad · come into use · for some reason

本课几乎通篇是被动语态：can be heard（现在）／was built（过去）／must have been driven（对过去的推测）／will be knocked down（将来）／have been offered（现在完成），一句话复习了被动语态的全套时态。
must have been + 过去分词：表示对过去情况有把握的推测，且主语是动作的承受者，所以用被动形式。
left 作后置定语：the few people left ＝留下来的少数人；left 在这里是 leave 的过去分词，不是过去式，不能理解为「离开了」。