can和could的例句
1、I could come next week, or the week after.
我可能下周来，或者再下一周。
2、How long can a human being go without sleep?
人不睡觉能活多久？
3、She could be dead for all I know.
He could hear someone moving around in the room above.
他能听到楼上屋里有人走动。
Could I trouble you to open the window, please?
劳驾，请您把窗户打开好吗？
You could always try his home number.
你总可以试着给他往家里打电话呀。