realizing that you 've spent the past 20 minutes looking at your watch and 
(ROOT (S (VP (VBG realizing) (SBAR (IN that) (S (NP (PRP you)) (VP (VBP 've) (VP (VBN spent) (NP (DT the) (JJ past) (CD 20) (NNS minutes)) (S (VP (VBG looking) (PP (IN at) (NP (PRP$ your) (NN watch)))))))))) (CC and)))
(ROOT (S (VP (VBG ) (SBAR (IN ) (S (NP (PRP )) (VP (VBP ) (VP (VBN ) (NP (DT ) (JJ ) (CD ) (NNS )) (S (VP (VBG ) (PP (IN ) (NP (PRP$ ) (NN )))))))))) (CC )))