致歉语的语用会体现文化的差异，影响着人与人之间的交流。那么英文的失约道歉信你知道怎么写吗?下面皮学网小编整理了英文的失约道歉信，供你参考。
DearLee,
ExcusemeformylongdelayinreturningtoyouyourUnderstandingandUsingEnglishGrammarwhichIreadthroughwithgreatinterest.Ihadfinishedreadingthebookandwaabouttoreturnitwhenafriendofminecametoseeme.
Neverhavingseenthebook,hewassointerestedinitthatIhadtoretainitlonger.
However,Ihopethatinviewoftheadditionaldelightthusaffordedbyyourbook,youwilloverlookmynegligenceinnotreturningitsooner.Thankingyoufortheloan.
Yourstruly,
Jim