what on earth is going on 
(ROOT (SBARQ (WHNP (WHNP (WP what)) (PP (IN on) (NP (NN earth)))) (SQ (VBZ is) (VP (VBG going) (PRT (RP on))))))
(ROOT (SBARQ (WHNP (WHNP (WP )) (PP (IN ) (NP (NN )))) (SQ (VBZ ) (VP (VBG ) (PRT (RP ))))))