非常不错的情态动词课件,很到位,符合任何高中学生使用
could 练习：1.He __________sing English songs at the age of 5 was able to and____________ sing "Merry Christmas". haven`t been able to 2.I________________go to work for a month. 3.The fire spread very quickly but everyone____________ was able to get out in the end.
(2)request/permission允许，请求=may/might,只 是could比can更委婉，客气:可以 —Can/Could I have a look at your photos? ---Of course,you can. You can smoke in this room. What can I do for you ? 练习:---Could you help me solve the math problem? can`t ---Sorry,I_____.