I am sorry to inform you that I won't be able to go to dance with you this weekend． My mother is suddenly taken ill．In order not to disappoint you，I have asked Shi Dai to take my place．She is a better dancer，I think．My regrets．
从便条中可以看出，英语表达先“果”—I won't be able to go to dance with you this weekend后“因”—my mother is suddenly taken ill，即所谓的“先果后因”。
Wednesday, 21st March
Dear Prof. Rainman,
I'm sorry I couldn't make our 11 o'clock appointment. Prof. Wolf's lecture lasted a lot longer than I expected. I could meet you in the library Reading Room 4 tomorrow at 10, if that is convenient for you. If not, please leave a note in my mailbox ＃334, this afternoon.
I have done all my things here. I sincerely thank you for the trouble you have taken for my sake. I am leaving for home by train at two this afternoon. This is to say good bye to you. Please kindly remember me to your wife.
Please reserve a double room and bath at Holiday Inn for Mrs. Robert Anselmi of Eagle Sports from December 3rd to December 6th. They will arrive the evening of the 3rd, before 6 p.m. and depart the 6th before 11 a.m.
If a room is not available for that weekend, please make other plans. Otherwise please advise her of the reservation.