今天的课

你好Grace.

我今天晚上工作通宵。可能推迟两天我们的课吗？ 明天肯定不起床！

对不起很短时间通知 （sorry for the late notice, I've been called in to a problem that may take all night. Could we reschedule our lesson?)

谢谢

P.S. 作业没忘了 :)