例如：Dear Xiao Dong,
I'm sorry you are having trouble in making friends .However,the situation is easy to change if you take my advice.Here are some tips to help you:
First,why not build up your confidence of making friends?You're sure you can get along well with them.
If you do this,it can help you a lot.Try to smile at the people when you meet them each time.Then try to talk to them of your own accord.
Secondly,you should give your friends a hand from time to time,especially when they are in trouble.
Then you can gain their respect and favourable impressions
Thirdly,it would be a good idea if you invite them to dinner constantly,they think you are so generous.
By doing this you can make a lot of friends.