[解析]
Dear Li Hua,
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.(写信目的并给出建议)
Firstly,why not take an active part in discussion?If you do this,you can express your own opinions,and at the same time listen to other people's views.(积极参加班级活动)
Secondly,you should learn about your classmates' likes and dislikes.Then you can find common interests with them.In this way you can get to know more different people and show them that you are friendly.(高分句型一)(了解同学们的兴趣爱好)
Last but not least,it's a good idea to be ready to help others in need.(高分句型二)That way your classmates will like making friends with you and you'll enjoy your school life together(乐于助人)
I hope you will find these suggestions useful.
Yours,
Ms Wang