tidy 整齐的,整洁的
lucky
unlucky
happy 快乐的 happy new year
unhappy
pleasant
unpleasant
情态动词
can
may
need
1 它是一种具有实际意义的助动词
2 情态动词不能单独作谓语,只能和后面的原形动词一起构成谓语
3 情态动词没有人称和数格的变化
4 含有情态动词的句子,否定句和疑问名都是在情态动词上发生变化
open the window 打开窗户
You must open the window.
She must open the window.
They must shut the door.
Amy must dust the dressing table
You mustn't open the window?
Must I open the window?
Yes, you must.
No, you needn't.
What must I do?
What must they do?
What must she do?
What must Amy do?
airforce 空军
air conditioner 空调
air express 航空快递邮件
aircraft carrier 航空母舰
walk on the air 飘飘然,得意洋洋
[clothes n. 衣服
cloth 布