I can't go to a party.Tell her that she can't join the party this Friday, because you have an appointment with the dentist, episode 5 o'clock and you don't think you'll be back in time for the party. Sorry to her.
Tell her that she can not join the party this Friday. Because you have an appointment with a dentist at 5 pm and you do not think you'll be back in time for the party to apologize to her.
I can't go to the party.Tell her that she can't join the party this Friday. Because you have an appointment with the dentist when 5 pm and you don't think you will come back in time for the party to apologize to her.