Must we drink eight cups of water every day?作否定回答no后面要有四个空
问题描述：
Must we drink eight cups of water every day?作否定回答
no后面要有四个空
答
no,we can not
答
No，you don't have to。
No，you needn't。（如是三個空）
答
No,you don't have to.