Thank you for your invitation, but I’m sorry, I can’t attend your party this Saturday because I’m going to an English game that morning, I’m going to the football club when I go down, and I’m going to have dinner at Grandpa’s house in the evening.
Thank you very much for your invitation, but I'm sorry, I can't go to your party this Saturday, because I'm going to an English game that morning, I'm going down to the football club, I'm going to my grandpa's house for dinner in the evening