you were thinking someone made off with your wallet 
(ROOT (S (NP (PRP you)) (VP (VBD were) (VP (VBG thinking) (SBAR (S (NP (NN someone)) (VP (VBD made) (PRT (RP off)) (PP (IN with) (NP (PRP$ your) (NN wallet))))))))))
(ROOT (S (NP (PRP )) (VP (VBD ) (VP (VBG ) (SBAR (S (NP (NN )) (VP (VBD ) (PRT (RP )) (PP (IN ) (NP (PRP$ ) (NN ))))))))))