1.书信

Dear <>

    I have received your letter where you asked me to recommend you a city suitable for teaching English,so I am writing to offer you some advice hoping that will be helpful.

    <> is a good choice.On the one hand,.....not only ....but also.....Moreover,.........,Therefore,........Thanks to....,since <> has ...., <> has .....

    I sincerely hope .....,I am looking forward to your reply......If you have further enquiries,dont hesitate to tell me.

2.写观点

1.引出话题（观点）

2.列支持观点的理由

3.总结

Living in an era of   <.>,we have witnessed an increasing popularity of online libraries which bring us much convenience than ever before

firstly......thirdly.......finally.......

to sum up....

(in my perspective,)

have far-reaching influence on 对...有深远的影响

3.广告

despite

1.简单介绍+原因

2.介绍

3.价格和联系方式

this bike only asks for 400$,almost half price of those sold on taobao website,making it a real bargain.

if you have interest about the .....,please contact me on 10231312.

4.新闻