when you instantly know whodunit 
(ROOT (SBAR (WHADVP (WRB when)) (S (NP (PRP you)) (ADVP (RB instantly)) (VP (VBP know) (NP (NN whodunit))))))
(ROOT (SBAR (WHADVP (WRB )) (S (NP (PRP )) (ADVP (RB )) (VP (VBP ) (NP (NN ))))))