Thanks for your invitation,but I'm sorry because I'm really busy on Friday. I have Chinese class at 8 o'clock and math class an hour later and music class at 11 o'clock. Besides, at 2 o'clock in the afternoon I have history class ,geography class at 3 o'clock and ideology class at 4 o'clock. Thanks for your invitation,but I'm sorry because I'm really busy on Friday. I have Chinese class at 8 o'clock and math class an hour later and music class at 11 o'clock. Besides, at 2 o'clock in the afternoon I have history class ,geography class at 3 o'clock and ideology class at 4 o'clock.