( ( ( Know ( common causes ) ) ( of ( acquired immunodeficiencies ) ) ) . )
(ROOT (NP (NP (JJ Know) (JJ common) (NNS causes)) (PP (IN of) (NP (VBN acquired) (NNS immunodeficiencies))) (. .)))
Know common causes of acquired immunodeficiencies.
(ROOT (S (NP (NP (NNP Exposure)) (PP (TO to) (NP (JJ chemical) (CC or) (JJ biological) (NNS agents)))) (VP (MD can) (VP (VB cause) (NP (DT an) (VBN acquired) (NN immunodeficiency)) (ADVP (RB later)) (PP (IN in) (NP (NN life))))) (. .)))