Dear john, How are you doing these days?l am lihua. l am writing to express my apology and hope you can forgive me. At first, l am sorry to say that l cannot watch opera with you on Saturday afternoon.l have just found that l have to attend an important after school activity.l sincerely hope the change will not cause you too much trouble. Shall we go on Sunday morning? we can set out early so that we will have more time to learn about culture.if its convenient for you,lets meet at8:00 outside the school.if not, please lets me know what time suits you best.last but not least,l am so sorry,hope you can forgive me. l am looking forward to your reply yours, lihua