Then watch your gift multiply.
( Then ( ( watch ( your ( gift multiply ) ) ) . ) )
(ROOT (S (RB Then) (VP (VB watch) (NP (PRP$ your) (NN gift) (NN multiply))) (. .)))
Your gift will help tremendously. 
( ( Your gift ) ( ( will ( help tremendously ) ) . ) )
(ROOT (S (NP (PRP$ Your) (NN gift)) (VP (MD will) (VP (VB help) (ADVP (RB tremendously)))) (. .)))