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Unit 3 Keep fit单元语法
1. 特殊疑问句（Health-related Questions）
疑问词：What, How often, How many, How much, Why
疑问词 提问内容 结构 实例
What 具体事物或行为 What + do/does + 主语 + 动词原形 —What do you eat for lunch —I eat rice and vegetables.
How often 频率 How often + do/does + 主语 + 动词 —How often do you exercise —I exercise three times a week.
How many 可数名词数量 How many + 复数名词 + ... —How many apples do you eat daily —I eat two apples.
How much 不可数名词数量 How much + 不可数名词 + ... —How much water do you drink —I drink six glasses a day.
Why 原因 Why + do/does + 主语 + 动词原形 —Why do you avoid junk food —Because it’s unhealthy.
技巧：
How many 后接可数名词复数，How much 后接不可数名词。
How often 回答需用频率副词（always, sometimes）或时间短语（twice a week）。
2. 情态动词 should/shouldn’t 的用法
结构：
肯定建议：主语 + should + 动词原形
You should sleep for 8 hours every night.
否定建议：主语 + shouldn’t + 动词原形
You shouldn’t stay up late.
实例：
—I feel tired every day.
—You should go to bed early and drink more water.
注意：回答建议时常用 Because 说明原因：
—Why should I eat vegetables
—Because they are good for your health.
3. 频率副词的用法
常见频率副词：always (100%), usually (80%), often (60%), sometimes (30%), never (0%)
位置 示例
实义动词前 I always wash hands before eating.
be动词/助动词后 She is never late for school.
句末（带时间短语） He plays basketball twice a week.
练习：
—How often do you drink milk
—I ______ drink milk. (usually / never)
4. 可数名词与不可数名词
规则：
类别 示例 量词搭配
可数名词 apple (apples), egg (eggs) three apples, a dozen eggs
不可数名词 milk, bread, advice a glass of milk, two slices of bread
注意：
不可数名词无复数形式，需用量词表达数量。
How many 提问可数名词，How much 提问不可数名词。
5. 形容词描述健康状态
常用形容词：healthy, unhealthy, fit, tired, energetic, sleepy
用法 示例
作表语 Junk food is unhealthy.
作定语 She has a healthy lifestyle.
宾语补足语 Exercise keeps you energetic.
练习：
—Why is Tom so sleepy
—Because he ______ (not sleep) enough last night.
学以致用
一、选词填空
（healthy / should / how often / much / many）
A: ______ do you eat fruit
B: I eat it every day.
A: ______ apples do you eat
B: Three. And I drink ______ water too.
A: You ______ keep this habit!
二、句型转换
I eat vegetables every day. (对划线部分提问)
______ ______ you eat vegetables
He should drink more milk. (改为否定句)
He ______ ______ more milk.
三、翻译句子
1.你应该每天锻炼半小时。
You ______ exercise for half an hour every day.
2.为什么不能喝太多可乐？
______ ______ you drink too much cola
综合练习
完形填空
It’s important to keep fit. You (1) ______ eat vegetables and fruits. You (2) ______ stay up late. Doing exercise (3) ______ good for your health. Remember to drink (4) ______ water every day!
(1) A. should B. shouldn’t C. need
(2) A. should B. shouldn’t C. must
(3) A. is B. are C. am
(4) A. many B. much C. few
答案示例
一、 How often, How many, much, should
二、 1. How often do 2. shouldn’t drink
三、 1. should 2. Why shouldn’t
完形填空：1. A 2. B 3. A 4. B
口诀：
"How many 数可数，How much 不可数；
Should 建议要记住，健康生活你做主！"

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