(S (S (NP (BASENP (NNS Workers)) (PP (IN at) (BASENP (JJ British) (JJ industrial) (NNS plants)))) (VP (VBP are) (VP (VP (VBG staging) (BASENP (JJ mass) (NNS walkouts))) (BASENP (DT this) (NN morning))))) (PERIOD .))