( ( Some ( psychoactive drugs ) ) ( , ( ( like ( ( caffeine and ) alcohol ) ) ( , ( ( have ( socially ( accepted uses ) ) ) . ) ) ) ) )
(ROOT (S (NP (DT Some) (JJ psychoactive) (NNS drugs)) (, ,) (PP (IN like) (NP (NN caffeine) (CC and) (NN alcohol))) (, ,) (VP (VBP have) (NP (RB socially) (VBN accepted) (NNS uses))) (. .)))
Some psychoactive drugs, like caffeine and alcohol, have socially accepted uses.
(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.