his hard to think was then is his friend .
(ROOT_0 (S_0 (ATS_3 (NP_1 (ATNP_0 (PRPDOLLAR_0 his) (JJ_0 hard)) (S_2 (VP_0 (TO_0 to) (VP_1 (VB_0 think))))) (VP_4 (ATVP_1 (VBD_1 was) (ADVP_0 (RB_0 then))) (VP_5 (VBZ_0 is) (NP_2 (PRPDOLLAR_0 his) (NN_0 friend))))) (DOT_0 .)))