Dear Jane and Rob, I'm writing to invite you both to my 18th birthday party on Saturday,December 4th。I'm having a meal in a restaurant with a few friends and then a party at my house。I would love you both to come if you can。If you need a place to stay for the night,you can sleep on the floor in our sitting room but please bring a sleeping bag。 The meal is at Mama Mis's,a good Italian restaurant。The party begins at 7:30 pm。There is a train,it leaves London,Liverpool Street at 5 pm and arrives in Cambridge at 6:45 pm. Hope you can come!