which fly by so fast there 's no time to think about them anyway 
(ROOT (SBAR (WHNP (WDT which)) (S (VP (VBP fly) (PRT (IN by)) (ADVP (ADVP (RB so) (RB fast)) (SBAR (S (NP (EX there)) (VP (VBZ 's) (NP (NP (DT no) (NN time)) (SBAR (S (VP (TO to) (VP (VB think) (PP (IN about) (NP (PRP them)))))))) (ADVP (RB anyway))))))))))
(ROOT (SBAR (WHNP (WDT )) (S (VP (VBP ) (PRT (IN )) (ADVP (ADVP (RB ) (RB )) (SBAR (S (NP (EX )) (VP (VBZ ) (NP (NP (DT ) (NN )) (SBAR (S (VP (TO ) (VP (VB ) (PP (IN ) (NP (PRP )))))))) (ADVP (RB ))))))))))