对比三句话的语气： You should drink more water.你该多喝水。（建议，不听也没事） You must take this medicine.你必须吃这药。（医嘱，不听会更糟） You have to go to school.你得去上学。（客观规定，不是你想不想）
should 最"软"，must 最"硬"，have to 夹在中间讲客观。看病时医生多用 should，只有开药方才用 must。
为什么 Unit 8 重点教 shouldKET 听力 Part 3 医生对话里，医生开口就是 "You should rest. You shouldn't go to school."；写作 Part 6 请假条里，学生解释 "I have a cold, so I should stay at home."。should 是健康话题的第一高频词。
should 的另一个用法：表推测should 还可以表示"应该会、大概"：The film should be interesting.（这电影应该会好看。）/ It should rain tomorrow.（明天大概会下雨。）KET 偶尔考，知道即可。
④ 完整体系：should 变形表 + 同义建议句 + 语气对比
先背 should 本体变形，再看它的"亲戚们"怎么表达同样的建议。
should 完整变形表（肯定 / 否定 / 疑问）
句式
结构
例句
中文
肯定
主语 + should + 动词原形
You should drink more water.
你该多喝水。
否定
主语 + should not (shouldn't) + 动词原形
You shouldn't stay up late.
你不该熬夜。
一般疑问
Should + 主语 + 动词原形?
Should I see a doctor?
我该去看医生吗？
特殊疑问
What / Where + should + 主语 + 动词原形?
What should I do?
我该怎么办？
缩略
should not = shouldn't
He shouldn't eat fast food.
他不该吃快餐。
常见病症与建议搭配速查
英文病症
中文
医生常用建议
a headache
头疼
You should rest. You shouldn't read in bed.
a cold
感冒
You should drink warm water. You should stay at home.
a fever
发烧
You should take this medicine. You should sleep a lot.
a cough
咳嗽
You shouldn't drink cold water. You should drink honey tea.
a toothache
牙疼
You should see a dentist. You shouldn't eat sweets.
a stomach ache
胃疼
You shouldn't eat fast food. You should eat warm food.
You'd better 的否定式You'd better = You had better（你最好），否定是 You'd better not + 原形：You'd better not go out.（你最好别出去。）它比 should 语气稍急，常带"否则会出事"的暗示。
三个必背细节
① should 后面永远接动词原形：should drink，不能说 should to drink 或 should drinks。
② 否定直接在 should 后加 not：shouldn't，不能说 don't should。
③ 疑问句把 should 提前：Should I...?，不能说 Do I should...?。
给建议的同义句型家族（KET 口语加分）
句型
语气
例句
中文
You should + 原形
温和建议
You should rest.
你该休息。
You shouldn't + 原形
温和劝阻
You shouldn't run.
你不该跑。
Why don't you + 原形?
提建议（"你为什么不…"）
Why don't you see a doctor?
你为什么不去看医生？
You'd better + 原形
稍急一点（"你最好…"）
You'd better take this medicine.
你最好吃这药。
How about + -ing?
轻松提议
How about drinking some hot tea?
喝点热茶怎么样？
should vs must vs have to（语气轻重辨析）should = 建议（"最好…"，不听也没事）：You should drink water. must = 必须（"一定得…"，不听有后果）：You must take this medicine three times a day. have to = 客观必须（"不得不"，外部规定）：You have to stay at home for two days. 考试怎么选：医生给一般建议用 should；开药方/医嘱用 must；学校/家长规定用 have to。
看病场景常用 should 搭配
症状
医生建议（should / shouldn't）
感冒 / 头疼
You should drink lots of water. You should rest. You shouldn't go to school.
牙疼
You should see a dentist. You shouldn't eat too many sweets. You should brush your teeth twice a day.
发烧
You should take this medicine. You should sleep early. You shouldn't play computer games for long.
胃疼
You shouldn't eat fast food. You should eat warm food. You should drink some hot water.
⑤ 四类使用场景全解（配图记忆）
场景
例句
记忆点
1 医生给健康建议
You should drink lots of water.
听力 Part 3 高频
2 劝阻朋友坏习惯
You shouldn't stay up late.
shouldn't = 不应该
3 自己问该怎么办
What should I do? Should I see a doctor?
看病开场问句
4 写作请假条解释原因
I have a cold, so I should rest at home.
Part 6 便条必用
⑥ 中国学生 5 大高频错误诊断
错误 1：should 后面加 to ✗ You should to drink water. → ✓ You should drink water. 口诀：情态动词后原形，不加 to。
错误 2：三单后 should 加 s ✗ He shoulds rest. → ✓ He should rest. should 是情态动词，所有人称形式一样，不加 s。
错误 3：否定用 don't should ✗ You don't should run. → ✓ You shouldn't run. 否定直接在 should 后加 not。
错误 4：疑问句用 Do I should ✗ Do I should see a doctor? → ✓ Should I see a doctor? 疑问句把 should 提前，不要 do。
错误 5：should 和 must 语气混用 ✗ 朋友感冒说：You must drink water! → ✓ You should drink water. 朋友之间用 should 建议；must 是医生/命令才用。
⑦ KET 考点与真题演练
题型
怎么考
应对
Reading Part 5 完形
短文里 should / shouldn't 后填动词原形
看到 should 就填原形
Listening Part 3 医生对话
听医生建议："You should rest."
圈 should 后的动词，就是答案
Listening Part 4 填表
填医嘱：一天吃几次、饭后吃
抓 should + 次数/时间
Writing Part 6 请假条
感冒请假："I should stay at home."
原因 + should 建议 + 请求
Speaking Part 1 健康题
"How do you stay healthy?"
用 should 说健康习惯
真题风格演练（KET 出题方式）
真题风格 · Part 5完形填空：You've got a cold. You (1) ___ drink lots of water. You (2) ___ go to school tomorrow.
(1) should（建议多喝水）；(2) shouldn't（不应该去上学，即在家休息）。
真题风格 · Listening Part 3听到医生说："You should take this medicine twice a day, after meals. You shouldn't eat sweets." —— 病人该怎么做？
饭后一天吃两次药，不吃糖。（take medicine twice a day after meals + shouldn't eat sweets）
真题风格 · Writing Part 6你感冒了，给老师写一张请假条：说明症状、建议在家休息、什么时候回校。（约 25 词）
参考：Dear Miss Green, I've got a cold and a headache. The doctor says I should rest at home for two days. I will be back on Wednesday. Thank you. Tom（症状 + should 建议 + 回校时间）
⑧ 背诵内容：10 个必备句型 + 医生给建议口语模板
每天背 3 句，3 天背完。背的时候注意 should 后全是原形。
1. You should drink lots of water. 你该多喝水。
2. You shouldn't stay up late. 你不该熬夜。
3.Should I see a doctor? 我该去看医生吗？
4. What should I do? 我该怎么办？
5. You should rest at home. 你该在家休息。
6. You shouldn't eat too many sweets. 你不该吃太多糖。
7.Why don't you take a warm shower? 你为什么不洗个热水澡？
8. You'd better take this medicine three times a day. 你最好一天吃三次这药。
9. He shouldn't play computer games for long. 他不该长时间玩电脑游戏。
10. We should wash our hands before meals. 我们饭前该洗手。
医生给建议口语模板（看病对话直接套）
Doctor: What's the matter? Patient: I've got a headache and a sore throat. Doctor: You've got a cold. You should drink lots of warm water and rest for two days. You shouldn't go to school tomorrow. Why don't you go to bed early tonight? You'd better take this medicine twice a day. You'll feel better soon.
基础 3变疑问：I should see a doctor. → ___ I ___ a doctor?
Should I see a doctor?（should 提前）
基础 4填空：You should ___ (take) this medicine twice a day.
take。should 后接原形。
基础 5填空：She shouldn't ___ (eat) too many sweets.
eat。shouldn't 后接原形。
基础 6填空：What ___ I do? I've got a headache.
should。What should I do? 我该怎么办？
进阶 7改错：He shoulds drink hot tea.
He should drink hot tea. should 不加 s。
进阶 8改错：You shouldn't to run in the hospital.
You shouldn't run in the hospital.（不加 to）
进阶 9选词：You ___ take this medicine three times a day. It's the doctor's order. (should / must)
must。医生的医嘱是硬性要求，用 must 比 should 语气更重。
进阶 10同义句：You should rest. = ___ don't you ___?
Why don't you rest? Why don't you + 原形 = 提建议。
进阶 11选句子：朋友牙疼，你怎么建议最礼貌？ A. You must see a dentist now! B. You should see a dentist. C. You don't see a dentist.
B。朋友之间用 should 温和建议；must 太命令。
挑战 12翻译：你不应该长时间玩电脑游戏，你最好早点睡觉。
You shouldn't play computer games for long. You'd better go to bed early.
挑战 13写请假条（KET Writing Part 6 风格）：你发烧了，给老师写便条请假两天。（约 25 词）
参考：Dear Mr Brown, I've got a fever and I feel very tired. The doctor says I should rest at home for two days. I will be back on Friday. Tom
挑战 14改错（4 处）：You shoulds drink water. You shouldn't to eat fast food. Do I should rest? You must to see a doctor.
① shoulds → should；② shouldn't to eat → shouldn't eat；③ Do I should → Should I；④ must to see → must see（must 后也接原形）。
挑战 15口语输出：朋友感冒了，用 should / shouldn't / Why don't you / You'd better 各写一句建议。
参考：You should drink lots of hot water. You shouldn't go to school today. Why don't you stay in bed? You'd better take this medicine twice a day.
⑪ 记忆口诀与 7 天复习计划
三句口诀
① should 是情态动词，后面原形不加 to；三单不加 s，否定直接加 not。
② 建议用 should，劝阻用 shouldn't；提建议 Why don't you + 原形，稍急用 You'd better。
③ should 软（建议），must 硬（命令），have to 夹中间讲客观。