DearProf.Patent,
IamverysorrytoinformyouthatIdidnotmanagetocompletethebookreportyouassignedlastweek,duetoasuddenillnessfallinguponmeafewdaysago.ForthepastfewdaysIhavebeeninhospitalwithacontinuousfever,whichhasthuspreventedmefromanyacademicactivity.Iherebysubmitthedoctor'snote.
Iwouldbeverymuchobligedifyoucouldgrantmeanotherweekforthetask,asmyhealthisturningbetter.
Hopeyoucanunderstandmysituationandacceptmyapology.
Yoursfaithfully,
LiMing