( Wells ( ( are ( drilled ( into aquifers ) ) ) . ) )
(ROOT (S (NP (NNP Wells)) (VP (VBP are) (VP (VBN drilled) (PP (IN into) (NP (NNS aquifers))))) (. .)))
Wells are drilled into aquifers.
(ROOT (S (NP (DT A) (-LRB- -LRB-) (NN n) (-RRB- -RRB-)) (ADVP (RB well)) (VP (VBZ is) (NP (NP (DT a) (NN hole)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN dug) (CC or) (VBN drilled) (PP (IN through) (NP (NP (DT the) (NN ground)) (ADVP (RB down) (PP (TO to) (NP (DT an) (NN aquifer)))))))))))) (. .)))