fixating on a far corner of the screen at times 
(ROOT (S (VP (VBG fixating) (PP (IN on) (NP (NP (DT a) (JJ far) (NN corner)) (PP (IN of) (NP (DT the) (NN screen))))) (PP (IN at) (NP (NNS times))))))
(ROOT (S (VP (VBG ) (PP (IN ) (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (DT ) (NN ))))) (PP (IN ) (NP (NNS ))))))