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7A Unit 4 精编知识讲义
Part 1 词汇变形 + 短语背诵
一、词汇变形
原词（词性） 变形1（词性） 变形2（词性） 中文含义
activity (n.) activities (n. 复数) —— 活动→（复数）活动
nature (n.) natural (adj.) —— 自然→自然的
amaze (v.) amazing (adj.) amazed (adj.) 使惊讶→令人惊讶的（修饰事物）→感到惊讶的（修饰人）
tire (v.) tiring (adj.) tired (adj.) 使疲劳→令人疲劳的（修饰事物）→感到疲劳的（修饰人）
practice (n.) practise (v.) practises (v. 单三) 练习（名词）→练习（动词，英式）→（三单）练习
grow (v.) grows (v. 单三) grew (v. 过去式) 生长→（三单）生长→（过去式）生长
start (v.) starts (v. 单三) started (v. 过去式) 开始→（三单）开始→（过去式）开始
language (n.) languages (n. 复数) —— 语言→（复数）语言
help (v./n.) helpful (adj.) helplessly (adv.) 帮助 / 帮助→有帮助的→无助地
interest (n./v.) interesting (adj.) interested (adj.) 兴趣 / 使感兴趣→令人感兴趣的→感兴趣的
二、短语背诵
1. take part in（参加，如 “All of us take part in the activity”）
2. take turns to do sth（轮流做某事，如 “My sister and I take turns to do different chores”）
3. go on a school trip（参加学校旅行，如 “We go on a school trip every year”）
4. hear from sb（收到某人来信，如 “I can hear from my friends every month”）
5. leave for + 地点（动身去某地，如 “The students will leave for that farm next Saturday”）
6. field trip（野外考察，如 “They are talking about the coming field trip”）
7. after-school activities（课外活动，，如 “They usually do after-school activities at 3:30 p.m.”）
8. be interested in (doing) sth（对…… 感兴趣，如 “I am interested in plants and animals”）
9. at weekends /on weekends（在周末，如 “My uncle usually goes fishing at the weekend”）
10. on weekdays（在工作日，如 “they are from 9 a.m. to 5 p.m. on weekdays”）
11. in the morning /afternoon（在上午 / 下午，如 “I read English in the morning”）
12. get close to nature（亲近大自然，如 “Climbing can help me get close to nature”）
13. take out the rubbish（倒垃圾，如 “then take out the rubbish”）
14. sweep the floor（扫地，如 “first I sweep the floor”）
15. would like to do sth（想要做某事，如 “I would like to go to Taipei with you”）
Part 2 单元知识点考点汇总
1. 知识点：take turns to do sth
【用法】表示 “轮流做某事”，“take turns” 后接动词不定式（to do），不可接动词 - ing 形式；主语通常为复数（多人轮流），也可用于单数主语（一人轮流做不同事）。【搭配】take turns to do sth /take turns (in) doing sth（in 可省略）【例句】Our English teacher often asks us to take turns to answer her questions. My sister and I take turns to do different chores.（Integration 文档）
【即学即用】The students ______ (take) turns to clean the blackboard every day.（答案：take）We should ______ (take) turns to look after the little baby.（答案：take）
2. 知识点：hear from & hear of /about
【用法辨析】
短语 含义 搭配 例句
hear from 收到某人的来信 / 消息 hear from + sb（人） I can hear from my friends every month.（Reading1 文档）
hear of / about 听说（某事 / 某人） hear of / about + sth/sb Have you heard of the new museum in our city
3. 知识点：amazing & amazed
【用法辨析】
单词 修饰对象 含义 搭配
amazing 事物 / 事件 令人惊讶的（强调事物的属性） 修饰名词（an amazing story, amazing news）
amazed 人 感到惊讶的（强调人的感受） be amazed at sth / be amazed to do sth
4. 知识点：through & by（表 “通过 / 凭借”）
【用法辨析】
介词 含义 搭配 例句
through 凭借（努力、过程） through + 名词（hard work, practice） We can make our dreams come true through our hard work.（Integration 文档）
by 通过（方式、手段） by + doing sth（动词 - ing） He learns English by listening to English songs.
5. 知识点：would like to do sth
【用法】表示 “想要做某事”，语气委婉，后接动词不定式（to do），否定形式为 “would not (wouldn’t) like to do sth”；可缩写为 “’d like to do sth”。
【搭配】would like to do sth /would like sb to do sth（想要某人做某事）
【例句】I would like to go to Taipei with you this afternoon.Tom would like to cook a meal for his mother on her birthday.】—Would you like ______ (go) for a walk with me —Yes, I’d love to.（答案：to go）My parents would like me ______ (learn) to play the piano.（答案：to learn）
Part 3 语法专项突破
（聚焦单元核心语法，含规则、例句与针对性练习）
考点一：介词 at /in/on（表时间）
【核心规则】
介词 适用时间范围 例词/短语 例句
at 具体时间点、固定搭配 at 7:00, at noon, at weekends I often get up at six o'clock.（Grammar 文档）
in 年 / 月 / 季节、上午 / 下午 / 晚上 in 2024, in July, in the morning My sister was born in 2000.（Grammar 文档）
on 具体日期、星期、特定上午 / 下午 on Monday, on October 12th, on a cold morning My cousin was born on New Year's Day.（Grammar 文档）
考点二：频度副词（usually, seldom, always, sometimes, never）
【核心规则】
1. 含义与程度（从 “总是” 到 “从不”）：always（100%）> usually（80%）> sometimes（50%）> seldom（20%）> never（0%）。
2. 位置：通常放在 “be 动词后、实义动词前”；情态动词 / 助动词后。
【例句】
Li Ping usually walks to work, but sometimes he goes to work by bike.
Lucy seldom goes out alone at night, because it's not safe.
【即学即用】
My mother ______ (usually) gets up at 6 a.m. on weekdays.（答案：usually）
He ______ (never) eats fast food because he wants to stay healthy.（答案：never）
—______ (do) you usually go to the library —On weekends.（答案：Do）
考点三：名词单复数（单元高频）
【核心规则】
1. 规则变化（单元高频）：
一般加 - s：nature→natures（泛指 “自然现象”）、trip→trips；
以 “辅音 + y” 结尾，变 y 为 i 加 - es：activity→activities（Integration 文档）、family→families；
以 “s/x/sh/ch” 结尾加 - es：class→classes、match→matches；
2. 不可数名词（单元高频）：nature（自然，不可数）、homework（作业，不可数）、peace（和平，不可数）。
【例句】
They usually do after-school activities at 3:30 p.m.
We hope people all over the world can live in peace.
【即学即用】
How many ______ (activity) do you have after school （答案：activities）
There are two ______ (match) on TV this evening.（答案：matches）
______ (nature) is our best friend. We should protect it.（答案：Nature）
考点四：句型转换（对时间、频率提问）
【核心规则】
1. 对 “具体时间点” 提问：用 “What time”，搭配助动词 do/does（主语为三单用 does）。
例：He does after-school activities at 4:30 p.m. → What time does he do after-school activities
2. 对 “频率” 提问：用 “How often”，搭配助动词 do/does。
例：Anita sometimes goes to her drawing lessons. → How often does Anita go to her drawing lessons
【例句】
—What time do you usually get up —At 6:30 a.m.
—How often do you go on a school trip —Once a year.
【即学即用】
They have lunch at 12:00 p.m.（对划线部分提问）→ ______ ______ do they have lunch （答案：What time）
She visits her grandparents twice a month.（对划线部分提问）→ ______ ______ does she visit her grandparents （答案：How often）
Part 4 易错点解析 + 即学即用
一、高频易错点解析
1. 名词单复数错误错误：activity→activitys（以 “辅音 + y” 结尾，未变 y 为 i 加 es）、match→matchs（以 ch 结尾，漏加 es）；正确：activity→activities、match→matches。
2. 介词时间搭配错误错误：in Monday（具体星期误用 in）、on the morning（泛指上午误用 on）；正确：on Monday、in the morning（特定上午如 “on a cold morning” 用 on）。
3. amazing 与 amazed 混淆错误：I am amazing at the news.（人作主语误用 amazing）；正确：I am amazed at the news.
4. take turns 后接动词形式错误错误：take turns doing sth（文档中高频为 to do，需优先掌握）；正确：take turns to do sth（初中阶段核心搭配）。
二、单元综合即学即用
1. My brother ______ (hear) from his pen pal last week.（答案：heard）
2. We should take turns ______ (clean) the classroom.（答案：to clean）
3. The ______ (amaze) trip made us feel ______ (amaze) all the way.（答案：amazing; amazed）
4. —______ do you go to the library —Twice a week.（答案：How often）
5. They will leave ______ Beijing for a field trip next month.（答案：for）
6. There are many after-school ______ (activity) in our school.（答案：activities）
7. We can make our dreams come true ______ hard work.（答案：through）
8. —Would you like ______ (go) swimming with me —Yes, I’d love to.（答案：to go）

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