Dear Ms and Mrs Brown
My English teacher organised some extra hours today so I'm going to be later today. Wee need to do more spelling exercises. I'm so sorry that I'm informing you about that so late but I wasn't home earlier. I think I will be home around 6 pm. I heard that you invited some of your friends so I hope that it's not going to complicate your plans for today's afternoon. Hope to see you later.