is effective if you stick with it 
(ROOT (VP (VBZ is) (ADJP (JJ effective)) (SBAR (IN if) (S (NP (PRP you)) (VP (VBP stick) (PP (IN with) (NP (PRP it))))))))
(ROOT (VP (VBZ ) (ADJP (JJ )) (SBAR (IN ) (S (NP (PRP )) (VP (VBP ) (PP (IN ) (NP (PRP ))))))))