Dear______,
Iamwritingthislettertoapologizetoyouformyfailingto.
Thereasonisthat______.IamsorrythatIcannotfinishintime,butisitpossiblethatImakeupthelossby?Ifso,Iwillputeverythingelseasideto.
Idohopethatyoucanunderstandmysituationandacceptmyapology.
Yourssincerely,
LiMing