2016-2017学年 人教版 必修1 unit2 England around the world Grammar 课件 (15)
2016-2017学年 人教版 必修1 unit2 England around the world  Grammar 课件 (15)第3页

command

Please open your books.

Can you open your books please?

Could / would you please open you books?

request

request

request

Request and command

Open your books.