( ( Aside ( from caffeine ) ) ( , ( ( the ( ( most ( commonly consumed ) ) ( psychoactive drug ) ) ) ( ( is alcohol ) . ) ) ) )
(ROOT (S (PP (RB Aside) (PP (IN from) (NP (NN caffeine)))) (, ,) (NP (DT the) (ADJP (RBS most) (RB commonly) (JJ consumed)) (JJ psychoactive) (NN drug)) (VP (VBZ is) (NP (NN alcohol))) (. .)))
Aside from caffeine, the most commonly consumed psychoactive drug is alcohol.
(ROOT (S (NP (NN Caffeine) (CC and) (NN alcohol)) (VP (VBP are) (NP (NP (CD two) (NNS examples)) (PP (IN of) (NP (DT a) (NN psychoactive))))) (. .)))
Caffeine and alcohol are two examples of a psychoactive.