Dear______,
①Iamwritingtoextendmysinceregratitudefor______(感谢的原因).②Ifithadnotbeenforyourassistancein______(对方给予的具体帮助),IfearthatIwouldhavebeen______(没有对方帮助时的后果).
③Everyoneagreesthatitwasyouwho______(给出细节).
④Again,Iwouldliketoexpressmywarmthankstoyou!Pleaseacceptmygratitude.
Yourssincerely,
LiMing