Now I am writing to ask if you would continue your support with a further donation for 1990.
( Now ( I ( ( am ( writing ( to ( ask ( if ( you ( would ( ( continue ( your support ) ) ( with ( ( a ( further donation ) ) ( for 1990 ) ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (ADVP (RB Now)) (NP (PRP I)) (VP (VBP am) (VP (VBG writing) (S (VP (TO to) (VP (VB ask) (SBAR (IN if) (S (NP (PRP you)) (VP (MD would) (VP (VB continue) (NP (PRP$ your) (NN support)) (PP (IN with) (NP (NP (DT a) (JJ further) (NN donation)) (PP (IN for) (NP (CD 1990)))))))))))))) (. .)))
You donated in the past, and so we would like you to donate even more in the future. 
( ( ( ( ( ( You ( donated ( in ( the past ) ) ) ) , ) and ) so ) ( we ( would ( like ( you ( to ( donate ( ( even more ) ( in ( the future ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (PRP You)) (VP (VBN donated) (PP (IN in) (NP (DT the) (NN past))))) (, ,) (CC and) (IN so) (S (NP (PRP we)) (VP (MD would) (VP (VB like) (S (NP (PRP you)) (VP (TO to) (VP (VB donate) (NP (NP (RB even) (JJR more)) (PP (IN in) (NP (DT the) (NN future)))))))))) (. .)))