英语便条的万能句

请求便条

I shall feel obliged if you will favor me with a call at your earliest convenience.（如您方便，请早日来电，我将不胜感激。）

感谢便条

I am writing to tell you how grateful I am for. . .

邀请便条

We should be very glad if you could come. . .

道歉便条

I'm so/terribly/extremly sorry that …