情景导入
体育课上老师问："你们每周锻炼几次？"有人天天跑步，有人一周一次，还有人……从来不动。英语里问频率就用：How often do you exercise? 回答可以是：Every day.（每天。）Twice a week.（一周两次。）Hardly ever.（几乎从不。）
"多久一次"是描述习惯的关键。本单元我们用 how often 句型和频度副词，聊聊锻炼、饮食、睡眠和上网时间——顺便看看你的生活习惯够不够健康。
核心词汇
| 单词/短语 | 词性 | 意思 | 例句 |
|---|---|---|---|
| exercise | v./n. | 锻炼 | How often do you exercise? |
| hardly ever | 短语 | 几乎从不 | I hardly ever stay up late. |
| once | adv. | 一次 | I swim once a week. |
| twice | adv. | 两次 | He plays tennis twice a month. |
| junk food | n. | 垃圾食品 | Eating junk food is bad for health. |
| habit | n. | 习惯 | Reading is a good habit. |
| at least | 短语 | 至少 | Sleep at least eight hours a night. |
| although | conj. | 虽然 | Although I'm busy, I exercise every day. |
频度副词按频率排序：always（总是）→ usually（通常）→ often（经常）→ sometimes（有时）→ hardly ever（几乎从不）→ never（从不）
句型与语法
核心句型：
- How often do you watch TV? — Twice a week.
- How often does she read English? — Every morning.
语法点一：how often 提问，频率短语回答
回答格式常见两种：① every + 时间（every day / every week）② 次数 + a + 时间单位（once a week, twice a month, three times a day）。注意：一次 once、两次 twice，三次及以上用"数词 + times"。
语法点二：频度副词的位置
口诀：实义动词前，be 动词后。
- She usually gets up at six. （实义动词 gets 之前）
- He is never late for school. （be 动词 is 之后）
语法点三：although 引导让步状语从句
Although I like junk food, I only eat it once a month. although 不能与 but 连用——用了 although 就不能再加 but。
听说训练
习惯大调查（用 how often 采访三位同学并记录）：
- How often do you exercise? — I run around the playground three times a week.
- How often do you eat vegetables? — Every day. My mom says they're good for me.
跟读要点：how often 中 how 的 /aʊ/ 要饱满；three times a week 注意 times 和 a 的连读。
辨析对比
① how often vs how long
- how often 问频率（多久一次）：How often do you swim? — Once a week.
- how long 问时长（持续多久）：How long do you swim each time? — For an hour.
② sometimes vs sometime
- sometimes：有时（频度副词）——I sometimes walk to school.
- sometime：某个时候——Come to my home sometime next week.
文化角
很多欧美中学生把运动当作"社交名片"：橄榄球、游泳、田径校队的训练一周多达五次。研究健康习惯时他们常说一句谚语：An apple a day keeps the doctor away.（一天一苹果，医生远离我。）这正是"次数 + a + 时间单位"的经典用法——an apple a day。
易错点
- 三次说成 three time：I exercise three time a week. ❌ → three times a week. ✅
- 频度副词位置错：She goes always to bed early. ❌ → She always goes to bed early. ✅
- although 和 but 连用：Although he is old, but he is healthy. ❌ → 去掉 but。✅
中考真题
— ______ do you go to the school library?
— Twice a week. I often borrow books about science.
A. How long B. How often C. How far D. How soon
✏️ 点击查看解答
答案：B
解析：本题考查疑问词组辨析。答语 "Twice a week"（一周两次）表示频率，应用 how often 提问，故选 B。
how long 问时长（回答 for two hours），how far 问距离（回答 two kilometers），how soon 问多久之后（回答 in two days），都与答语不符。
考点
- how often / how long / how far / how soon 辨析是中考单选高频考点，判断依据永远看答语；
- 频度副词位置（实义动词前、be 动词后）常在语法填空和改错中出现；
- 写作应用："健康生活习惯"是中考书面表达热门话题，用上 exercise three times a week、hardly ever stay up late 等表达能稳拿要点分。
诵读 Read Aloud
I'm a student from Hangzhou, and I try my best to keep a healthy lifestyle. I always get up at six thirty and hardly ever stay up late. Although I'm busy with my homework, I exercise at least three times a week. I usually run along the Grand Canal near my home, and sometimes I ride a bike around the West Lake with my parents. As for eating habits, I eat vegetables and fruit every day, but I only eat junk food once a month. I also drink milk every morning because it's good for my health. My favorite saying is "An apple a day keeps the doctor away." Good habits make a good life!
诵读小贴士：朗读时给每个频度副词（always, hardly ever, usually, sometimes）标上着重号，感受它们在句中的位置；这篇范文就是中考"健康习惯"作文的标准模板。