Dear Jack,
I am happy to hear that you are going to our school.
I've asked my parents who have both agreed to let you stay at my house.They really like you and are both happy about your arrival.
You can choose to share a bedroom with me or you can sleep in the guest room.We can provide food and will drive you to school with me.
This will be a great chance for us to exchange our language skills.We can alternate in helping each other with English and Chinese.We can also help each other out when it comes to exams.Hopefully we will both improve our language skills.I will also introduce you to all my school friends.
I look forward to seeing you soon.
Sincerely
Hua Li
写得有点短,比较简单.
如果想要长一点,或者复杂一点的,