( ( When ( installing ( a well ) ) ) ( , ( ( a hole ) ( ( is ( ( drilled ( into ( the ground ) ) ) ( to ( tap ( into ( ( an aquifer ) ( for ( drinking water ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (VP (VBG installing) (NP (DT a) (NN well))))) (, ,) (NP (DT a) (NN hole)) (VP (VBZ is) (VP (VBN drilled) (PP (IN into) (NP (DT the) (NN ground))) (S (VP (TO to) (VP (VB tap) (PP (IN into) (NP (NP (DT an) (NN aquifer)) (PP (IN for) (NP (NN drinking) (NN water)))))))))) (. .)))
When installing a well, a hole is drilled into the ground to tap into an aquifer for drinking water.
(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)))))))))))) (. .)))