This letter is to ask for your support in remembering your fellow classmate.
( ( This letter ) ( ( is ( to ( ( ask ( for ( your support ) ) ) ( in ( remembering ( your ( fellow classmate ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This) (NN letter)) (VP (VBZ is) (S (VP (TO to) (VP (VB ask) (PP (IN for) (NP (PRP$ your) (NN support))) (PP (IN in) (S (VP (VBG remembering) (NP (PRP$ your) (JJ fellow) (NN classmate))))))))) (. .)))
The letter is to denounce your classmate and his life. 
( ( The letter ) ( ( is ( to ( denounce ( ( ( your classmate ) and ) ( his life ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN letter)) (VP (VBZ is) (S (VP (TO to) (VP (VB denounce) (NP (NP (PRP$ your) (NN classmate)) (CC and) (NP (PRP$ his) (NN life))))))) (. .)))