是否有愈发错误

是否有有语法错误。i am writing this wmail to tell you that i worked as a teacher.

是的，该句中有语法错误。应该是 "我写这封邮件是为了告诉你，我曾经担任过一名教师。"

正确的英文句子应该是："I am writing this email to tell you that I used to work as a teacher."