who to be at that <apostrophe><apostrophe>
(ROOT_0 (S_0 (ATS_2 (SBAR_0 (WHNP_0 (WP_0 who)) (S_2 (VP_0 (TO_0 to) (VP_1 (VB_0 be))))) (ADVP_0 (IN_1 at) (DT_1 that))) (APOSTROPHE_0 <apostrophe><apostrophe>)))