loneliness can make people act weird 
(ROOT (S (NP (NN loneliness)) (VP (MD can) (VP (VB make) (S (NP (NNS people)) (VP (VB act) (ADJP (JJ weird))))))))
(ROOT (S (NP (NN )) (VP (MD ) (VP (VB ) (S (NP (NNS )) (VP (VB ) (ADJP (JJ ))))))))