Dear Liu Qi,
I'm writing to tell you that the students of our school are planning to go on a school trip to Beijng from October 20th to 27th. I'd like to invite you to come and join us. I remember you tell me that you like travelling. We'll visit many places of interest, such as the Great Wall, the Palace Museum and the Summer Palace. If it doesn't rain, we'll also go camping at the foot of the Great Wall. We'll stay at the Beijing Holiday Village. During these days, we'll have parties. At the parties, the students will sing, dance and play games together. Would you please write back to tell me if(是否 ) you will come? We need to buy the train tickets ahead of time(提前).
Yours
Millie