presume their audience wo n't sit still for a sociology lesson 
(ROOT (VP (VB presume) (SBAR (S (NP (PRP$ their) (NN audience)) (VP (MD wo) (RB n't) (VP (VB sit) (ADVP (RB still)) (PP (IN for) (NP (DT a) (NN sociology) (NN lesson)))))))))
(ROOT (VP (VB ) (SBAR (S (NP (PRP$ ) (NN )) (VP (MD ) (RB ) (VP (VB ) (ADVP (RB )) (PP (IN ) (NP (DT ) (NN ) (NN )))))))))