Don't eat in class!
一、短语
1. in class在课上
2. on school nights在上学的晚上
3. school rules校规
4. no talking禁止交谈
5. listen to music听音乐
6. have to不得不
7. take my dog for a walk带狗去散步
8. eat outside在外面吃饭
9. in the hallway在走廊上
10. wear a uniform穿制服
11. arrive late for class上学迟到
12. after school放学后
13. practice the guitar练习弹吉它
14. in the cafeteria在自助食堂里
15. meet my friends和我朋友见面
16. by ten o'clock十点之前
17. be in bed在床上
18. the Children's Palace少年宫
19. help my mom make dinner帮助我妈做饭
二、重点句型
1. Don't arrive late for school. ＝ Don't be late for school.
2. Don't fight.
3. Don't listen to music in the classroom.
4. Don't run in the hallways.
5. Don't smoke. It's bad for your health.
6. Don't play cards in school.
7. Don't talk in class.
8. Don't watch TV on school nights.
9. Don't sleep in class.
10. Don't play sports in the classrooms.
11. Don't sing songs at night.
12. Don't talk when you eat.
13. Don't wear hats in class.
14. Do homework by 10:00.
15. Clean your house!
16. Make the bed.
17.— Can we……? — Yes, we can. / No, we can't.
Eg:— Can we arrive late for class? — No, we can't. We can't arrive late for class.
18.— Do you have to wash your clothes? — Yes, I do. / No, I don't.
三、重难点解析
1.情态动词 have to的用法，意思是“必须、不得不”，它侧重于客观上的必要和外界的权威。
（ 1）肯定形式：主语+ have to+动词原形+其他（一般现在时，主语是第三人称单数时，用 has to；句子是过去时，用 had to。）。如：
We have to wear sneakers for gym class. 在体育课上，我们必须穿运动鞋。
Tom has to practice the guitar every day. 汤姆每天必须练习弹吉它。
I had to get up at 5:00 am last Monday. 上周一，我不得不早上 5点起床。
（ 2）否定形式：主语+ don't have to+动词原形+其他（一般现在时，主语是第三人称单数时，用 doesn't have to；句子是过去时，用 didn't have to。）。如：
Nick doesn't have to wear a uniform. 尼克不必穿制服。
We didn't have to do our homework at once. 我们不必马上完成作业。
（ 3）疑问句： Do（ Does或 Did）+主语+ have to+动词原形+其他。如：
— Do you have to stay at home on weekends? 周末你必须呆在家里吗？
— Yes, I do. / No, I don't. 是的，我必须。不，我不必。
2.情态动词 can的用法
（ 1）表示能力，意思是“会；能”。如：
Can you play the guitar? 你会弹吉它吗？
Judy can speak a little Chinese. 朱蒂会说一点中文。
I can dance and sing. 我能唱歌又能跳舞。
（ 2）表示允许、许可，意思是“可以；能”。如：
Can the students run in the hallways? 学生们可以在走廊上跑吗？
We can eat outside. 我们可以在外面吃东西。
Can I come in? 我能进来吗？
注意同样是情态动词， can和 have to的用法是有区别的，和大部分情态动词一样， can在否定句中，直接在 can后加上 not，在疑问句中，把 can放到主语前面，并且没有人称和数的变化。
3. hear， listen和 sound都有“听”的意思，但三者是有区别的。如：
（ 1） hear“听说”，侧重于“听”的内容。
I'm sorry to hear that you are ill. 听说你生病了，我很难过。
I never heard such an interesting story. 我从来没听过这么有趣的一个故事。
（ 2） listen“听”，侧重于“听”这一动作。
Listen to me carefully. 认真听我说。
The children like to listen to music. 孩子们喜欢听音乐。
（ 3） sound“听起来”，它是系动词，后面接形容词等。
That sounds great. 那听起来真不错。
It sounds like fun. 听起来挺有趣。
4. be in bed“在床上、卧床”， in和 bed之间不能用冠词， bed也不用复数。
He is in bed for 10 years. 他卧床 10年了。
Dave has to be in bed early every night. 大卫每晚必须很早睡觉。
5. arrive late for与 be late for意思相近，意为“迟到”。
Don't arrive/ be late for school. 上学别迟到。
I arrived/ was late for the meeting yesterday. 我昨天开会迟到了。
6. No talking!“禁止交谈！”， no后面加上名词或动名词（ doing）也表示不要做某事，与 don't+ do的用法相似。
No wet umbrellas! = Don't put wet umbrellas here! 禁止放湿雨伞！
No food! = Don't eat food here! 禁止吃食物！
No smoking! = Don't smoke here! 禁止吸烟！
7.语法（祈使句）
祈使句是用来表示请求、命令、叮嘱、号召或者劝告等的句子，这类句子的主语常是第二人称 you，也就是听话者，因而 you常省去了。祈使句的开头是动词原形。如：
Look out! 小心！
Wait here for me! 在这等我！
Be sure to come here on time! 务必准时来到这里！
祈使句的否定形式多以 do not（常缩写成 don't）开头，再加上动词原形。
Don't arrive late for school. 上学别迟到。
Don't fight! 别打架！
Don't look out of the window. 不要向窗外看。
