1.Dear Mr. Philips，
尊敬的菲利普斯先生：

Dear Bill,
亲爱的比尔：

2.To whom it may concern,
致相关负责人：

To whom it may concern,
This is to certify that Mr. Warren Collins has been working for Main Street Sports since January 3rd.

致相关负责人：

我谨证明Warren Collins先生自1月3日起一直在Main Street Sports公司任职。