( ( The sinkhole ) ( ( ( may then ) ( ( ( fill ( with water ) ) and ) ( become ( ( ( a lake ) or ) ( a pond ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN sinkhole)) (VP (MD may) (RB then) (VP (VP (VB fill) (PP (IN with) (NP (NN water)))) (CC and) (VP (VB become) (NP (NP (DT a) (NN lake)) (CC or) (NP (DT a) (NN pond)))))) (. .)))
The sinkhole may then fill with water and become a lake or a pond.
(ROOT (S (NP (NNS Craters) (CC and) (NNS rifts)) (VP (VBP become) (NP (NNS lakes)) (SBAR (WHADVP (WRB when)) (S (NP (PRP they)) (VP (VBP fill) (PP (IN with) (NP (NN water))))))) (. .)))