I <apostrophe>s They never discovered Quechua .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 I)) (VP_4 (VBZ_0 <apostrophe>s) (S_1 (ATS_1 (NP_1 (PRP_0 They)) (ADVP_0 (RB_0 never))) (VP_3 (VBD_0 discovered) (NP_3 (NNP_1 Quechua)))))) (DOT_0 .)))