应用文写作感谢信A：感谢对方、你的收获、邀请对方来访B：任期将满归国的外教（老师对你在学习上和生活上的帮助、表达感激之情及祝愿）C：对英语老师表示感谢（absent-minded/get involved in/upset/discouraged/poor performance/my efforts pay off.）写作思路：表达感谢：.take this opportunity to extend/convey/express my heartfelt appreciation/thanks/gratitude to the assistance you offered me.Any appreciation for your generous help is beyond words.Thank you for your time/kindness/consideration.说明事由再次表示感谢：Thanks again!Again! I would like to express my warm thanks
