be sure to do sth

　　另外,其它用法：

　　1 ---Will she come next Sunday?她下周日来吗?

　　---Sure.当然了.

　　2 You asked me when to start.I am not sure about it.你问我何时出发.这事我说不准.

　　3 We are sure that we will win.我们肯定会赢.

　　4 Please make sure that the light is turned off when you leave the room.离开房间时务必关灯.

　　希望对你有所帮助.