上课不能吃东西。Don't eat in class,

 准时，按时 on time,

 听    listen to,

 在课上     in class,

   做  迟到 be late for,

饭厅，餐厅    dining hall,

 安静 be quiet,

 外出 go out ,

 清洗餐具 do the dishes,

 做早饭    Make breakfast,

 铺床     make one's bed,

 吵闹     be noisy,

 留短发 keep one's hair short,

  和某人一起玩     play with somebody,

 弹钢琴 play the piano,

 玩得高兴 have fun,

制订规则  make rules,

 make up rules,

学校规章制度 school rules ,

准时 on time,

及时in time,

 违反规章制度  break the rules,

 遵守规章制度  follow the rules,

 遵守规章制度  keep the rules,

  上课迟到 arrive late for class ,

be late for class,

  在教室里吃东西 eat in the classroom,

戴帽子  wear a hat,

wear hats,

校服 school uniforms,

穿制服 wear uniforms,

我明白了 I see,

根据，依据 according to,

 和某人分享share something with somebody,

在上学期间on school days,

在校期间的晚上   on school nights,

 练习弹钢琴     practice the piano,

playing the piano,

看望朋友see friends,

打扫房间 clean one's room,

洗餐具do the dishes,

太多的(可数)too many,

太多的(不可数 )    too much,

 学（做某事）      learn to do,

去睡觉go to bed,

 在床上be in bed,

考虑think about,

对某人要求严格be strict with somebody ,

不要说话Don't talk,

No talking,

Don't + 动词原形+其他， 不要做某事。    

 帮助某人做某事 help somebody do something,

 help somebody to do something,

 too many + 可数名词复数   太多的

 练习做某事 practice doing something,

 对某人要求严格    be strict with somebody,

 对某事要要求严格 be strict in something,

 把某物忘在某地 leave something someplace,

 keep + 宾语+形容词    使   保持某种状态

 学会做某事    learn to do something,

 不得不做某事have to do something,

 上课不要迟到。 Don't arrive late for class,

  我们可以带音乐播放器到学校吗？ Can we bring music players to school?,

 并且我们总是不得不穿校服。 And we always have to wear the school uniform,

 有太多的规则！ There are too many rules!,

 不要把脏盘子留在厨房里！ Don't leave the dirty dishes in the kitchen!,

 我不得不留短发。 I have to keep my hair short,

情态动词have to, 意思是"必须、不得不"，它侧重于客观上的必要和外界的权威。

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,

 在体育课上，我们必须穿运动鞋。We have to wear sneakers for gym class,

 汤姆每天必须练习弹吉它。Tom has to practice the guitar every day,

 上周一，我不得不早上5点起床。   I had to get up at five am last Monday,

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,

 尼克不必穿制服。Nick doesn't have to wear a uniform,

 我们不必马上完成作业。  We didn't have to do our homework at once,

疑问句：Do,  Does,或者Did,＋主语＋have to, ＋动词原形＋其他  

  周末你必须呆在家里吗？Do you have to stay at home on weekends?,

  昨晚，他不得不11点前上床睡觉吗？Did he have to go to bed by eleven last night?,

can表示能力，"会""能"

  你会弹吉它吗？Can you play the guitar?,

 朱蒂会说一点中文。Judy can speak a little Chinese,

 我能唱歌又能跳舞。  I can dance and sing,

Can表示允许、许可，"可以"、"能"

  学生们可以在走廊上跑吗？Can the students run in the hallways?,

 我们可以在外面吃东西。We can eat outside,

  我能进来吗？  Can I come in?,

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。   

 在床上、卧床be in bed,

in， 和bed，之间不能用冠词，bed，也不用复数。  

 他卧床10年了。He is in bed for 10 years,

大卫每晚必须很早睡觉。  Dave has to be in bed early every night,

 "迟到" arrive late for,

be late for,

 上学别迟到。Don't arrive late for school,  

Don't be late for school,

我昨天开会迟到了。  I was late for the meeting yesterday，

I arrived late for the meeting yesterday,

 "禁止交谈！"No talking !,

no后面加上名词或动名词也表示不要做某事。与don't +do的用法相似。

禁止放湿雨伞！ No wet umbrellas!  

Don't put wet umbrellas here! ,

 禁止吃食物！No food!

Don't eat food here!,

 禁止吸烟！No smoking!

Don't smoke here!,