今日语法
1.否定祈使句
Don't+祈使句
Don't eat in the computer room.
2.为使祈使句更有礼貌，加上please
Please sit down.
3.play+球类
play football
play basketball
4.play+the+乐器
play the piano
play the violin
5.before连词（在……之前）
please raise your hand before you speak.
6.run out of (从……跑出来)
he runs out of the door.
7.to the music随着音乐
he dances to the music
8.look at看
(at点对点，精准)
look at
shoot at
aim at
stare at
