What and who will they tax?
( ( What and ) ( ( who ( ( will they ) tax ) ) ? ) )
(ROOT (UCP (NP (WP What)) (CC and) (SBAR (WHNP (WP who)) (S (VP (VB will) (NP (PRP they)) (NP (NN tax)))) (. ?))))
We know all about their tax plan.
( We ( ( know ( all ( about ( their ( tax plan ) ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (VBP know) (NP (NP (DT all)) (PP (IN about) (NP (PRP$ their) (NN tax) (NN plan))))) (. .)))