( ( ( Tell emotion ) just ) ( by ( facial expression ) ) )
(ROOT (S (VP (VB Tell) (NP (NN emotion)) (ADVP (RB just)) (PP (IN by) (NP (JJ facial) (NN expression))))))
Tell emotion just by facial expression
(ROOT (S (NP (JJ Human) (JJ facial) (NNS expressions)) (VP (MD can) (VP (VB communicate) (NP (NNS emotions)))) (. .)))