(S (S (NP (BASENP (DT The) (NNP British) (NNP Royal) (NNP Navy)) (PRN (COMMA ,) (SBAR (WHNP (WDT which)) (S (ADVP (RB usually)) (VP (VP (VBZ deploys) (BASENP (NN two) (NNS ships))) (PP (TO to) (BASENP (DT the) (NNP Caribbean)))))) (COMMA ,))) (VP (VBZ has) (VP (VP (VBN placed) (NP (BASENP (DT the) (NN destroyer) (NNP HMS) (NNP Liverpool)) (CC and) (BASENP (DT the) (NN tanker) (NNP RFA) (NNP Wave) (NNP Knight)))) (PP (IN on) (BASENP (NN standby)))))) (PERIOD .))