Dear Amy,
Please come to my birthday party tomorrow.Now let me tell you how to come:Start from the bus stop in front of our school.Take the No.17 bus.Get off at the post office.Walk straight for 5 minutes.You can see a white building.It's a cinema.Then turn left at the cinema.You can see a red house.It's my home.I am waiting for you near the door.
Yours,
Sarah