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Unit 3 Keep Fit
（一般现在时表习惯/情态动词should/shouldn’t/动词短语）
一、核心语法 —— 知识点精讲（学生必背）
1. 一般现在时表习惯、日常活动（核心必考）
用法：表示经常性、习惯性的动作或日常活动，贴合本单元“保持健康”主题（描述健康的生活习惯）。
标志词：every day, every morning/evening, usually, often, always, never, sometimes
结构：
肯定：主语（三单） + 动词-s/-es + 其他；主语（非三单） + 动词原形 + 其他
否定：主语（三单） + doesn’t + 动词原形 + 其他；主语（非三单） + don’t + 动词原形 + 其他
疑问：Does + 主语（三单） + 动词原形 + 其他？ / Do + 主语（非三单） + 动词原形 + 其他？
动词-s/-es变化规则（贴合本单元词汇）：
1. 一般 + s：exercise → exercises, eat → eats, drink → drinks
2. 以s, x, ch, sh, o结尾 + es：wash → washes
3. 以辅音字母 + y结尾，变y为i + es：study → studies
例句（贴合单元话题）：
① I exercise every morning.（非三单肯定句：我每天早上锻炼。）
② He doesn’t eat too much junk food.（三单否定句：他不吃太多垃圾食品。）
③ —Do you drink milk every day —Yes, I do.（非三单疑问句及回答：你每天喝牛奶吗？是的，我喝。）
2. 情态动词should/shouldn’t的用法（重点必考）
用法：表示“应该、应当”（should）和“不应该”（shouldn’t），用于给出保持健康的建议，贴合本单元主题。
标志词：should（应该）, shouldn’t（不应该，= should not）
结构（所有主语通用，无变化）：
肯定（应该做）：主语 + should + 动词原形 + 其他
否定（不应该做）：主语 + shouldn’t + 动词原形 + 其他
疑问（应该做吗？）：Should + 主语 + 动词原形 + 其他？ （回答：Yes, 主语 + should. / No, 主语 + shouldn’t.）
例句（贴合单元话题）：
① We should eat more vegetables.（肯定句：我们应该多吃蔬菜。）
② You shouldn’t stay up late.（否定句：你不应该熬夜。）
③ —Should I drink more water —Yes, you should.（疑问句及回答：我应该多喝水吗？是的，你应该。）
3. 健康类动词短语（易错重点）
用法：本单元核心短语，多与健康习惯、锻炼、饮食相关，需熟练掌握并运用在句子中。
核心短语（必考）：
1. keep fit 保持健康 2. take exercise 锻炼 3. eat a balanced diet 均衡饮食
4. stay up late 熬夜 5. drink enough water 喝足够的水 6. wash hands 洗手
例句（贴合单元话题）：
① She takes exercise every afternoon to keep fit.（她每天下午锻炼来保持健康。）
② We shouldn’t stay up late if we want to keep healthy.（如果我们想保持健康，就不应该熬夜。）
4. 常用句型（贴合本单元健康主题，必考）
I/We usually/often + 动词原形 + every day.（我/我们每天经常做某事。）
He/She + 动词-s/-es + every morning.（他/她每天早上做某事。）
We should/shouldn’t + 动词原形.（我们应该/不应该做某事。）
Should I/we + 动词原形 （我/我们应该做某事吗？）
二、核心语法 —— 专项练习题（基础 + 提高）
一、用所给动词的正确形式填空
1. I __________ (exercise) every morning to keep fit.
2. He __________ (not eat) junk food. He eats healthy food every day.
3. We __________ (should) eat more fruits and vegetables. It’s good for our health.
4. —What __________ you __________ (do) every evening —I drink a glass of milk.
5. She __________ (wash) her hands before meals every day.
6. You __________ (shouldn’t) stay up late. It’s bad for your eyes.
7. They __________ (take) exercise every afternoon after school.
8. My father __________ (not drink) coffee. He drinks tea every day.
9. —Should we __________ (drink) enough water —Yes, we should.
10. He __________ (study) hard and __________ (exercise) every day.
二、单项选择
( ) 1. —What do you do every morning —I __________ exercise to keep fit.
A. do B. does C. doing
( ) 2. We __________ eat too much sugar. It’s bad for our teeth.
A. should B. shouldn’t C. must
( ) 3. He __________ a glass of milk every evening before going to bed.
A. drink B. drinks C. drinking
( ) 4. —__________ I take exercise every day —Yes, you should.
A. Should B. Do C. Does
( ) 5. They __________ stay up late. They go to bed early every night.
A. don’t B. doesn’t C. aren’t
( ) 6. —Do you eat a balanced diet —Yes, I __________.
A. do B. does C. should
( ) 7. She __________ wash her hands before meals. It’s a good habit.
A. should B. shouldn’t C. don’t
( ) 8. My mother __________ exercise every morning. She is very healthy.
A. take B. takes C. taking
( ) 9. —What __________ he do every afternoon —He plays basketball.
A. do B. does C. should
( ) 10. We should __________ enough water every day to keep fit.
A. drink B. drinks C. drinking
三、句型转换
1. I exercise every morning.（否定句）I __________ __________ exercise every morning.
2. He eats healthy food every day.（一般疑问句）__________ he __________ healthy food every day
3. We should take exercise every day.（否定句）We __________ __________ take exercise every day.
4. She washes her hands before meals.（对划线提问）__________ __________ she __________ before meals
5. Should we drink enough water （肯定回答）Yes, __________ __________.
6. They take exercise every afternoon.（否定句）They __________ __________ exercise every afternoon.
7. He doesn’t stay up late.（改为肯定句）He __________ __________ late.
8. We should eat a balanced diet.（对划线提问）__________ __________ we __________
四、用should/shouldn’t, 动词原形/动词-s/-es填空
1. I __________ (exercise) every day. It helps me keep fit.
2. You __________ (not eat) junk food. It’s bad for your health.
3. He __________ (drink) a glass of water every morning.
4. We __________ (wash) our hands before meals.
5. She __________ (not stay) up late. She needs enough sleep.
6. —__________ we take exercise every day —Yes, we should.
7. They __________ (eat) more vegetables to keep healthy.
参考答案
一、用所给词的适当形式填空
1. exercise 2. doesn’t eat 3. should 4. do; do 5. washes 6. shouldn’t 7. take 8. doesn’t drink 9. drink 10. studies; exercises
二、单项选择
1.A 2.B 3.B 4.A 5.A 6.A 7.A 8.B 9.B 10.A
三、句型转换
1. don’t do 2. Does; eat 3. should not 4. What does; do 5. we should 6. don’t take 7. stays up 8. What should; do
四、用should/shouldn’t, 动词原形/动词-s/-es填空
1. exercise 2. shouldn’t eat 3. drinks 4. should wash 5. shouldn’t stay 6. Should 7. should eat

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