( ( To ( begin with ) ) ( , ( ( these crabs ) ( ( ( can only ) ( ( survive ( in water ) ) ( ( a ( few feet ) ) deep ) ) ) . ) ) ) )
(ROOT (S (S (VP (TO To) (VP (VB begin) (PP (IN with))))) (, ,) (NP (DT these) (NNS crabs)) (VP (MD can) (ADVP (RB only)) (VP (VB survive) (PP (IN in) (NP (NN water))) (ADVP (NP (DT a) (JJ few) (NNS feet)) (RB deep)))) (. .)))
To begin with, these crabs can only survive in water a few feet deep.
(ROOT (S (NP (JJS Most) (NNS people)) (VP (MD can) (VP (VB survive) (NP (QP (RB only) (DT a) (JJ few)) (NNS days)) (PP (IN without) (NP (NN water))))) (. .)))