我们在工作或生活中，有时难免会犯一些错误，写封致歉信就显得很有必要。道歉信通常包括以下内容：表示歉意;道歉的原由;出现差错的原因;提出弥补措施;请求原谅。写道歉信的语言要诚挚，解释的理由要真实，不要显出丝毫的虚情假意。好的
DearProf.Patent,
IamverysorrytoinformyouthatIdidnotmanagetocompletethebookreportyouassignedlastweek,duetoasuddenillnessfallinguponmeafewdaysago.ForthepastfewdaysIhavebeeninhospitalwithacontinuousfever,whichhasthuspreventedmefromanyacademicactivity.Iherebysubmitthedoctor'snote.
Iwouldbeverymuchobligedifyoucouldgrantmeanotherweekforthetask,asmyhealthisturningbetter.
Hopeyoucanunderstandmysituationandacceptmyapology.
Yoursfaithfully,