What about the hole?" They scanned the cliff-side narrowly.
( ( ( What ( about ( the hole ) ) ) ? ) ( '' ( They ( ( ( scanned ( the cliff-side ) ) narrowly ) . ) ) ) )
(ROOT (S (FRAG (SBARQ (WHNP (WHNP (WP What)) (PP (IN about) (NP (DT the) (NN hole)))) (. ?))) ('' '') (NP (PRP They)) (VP (VBD scanned) (NP (DT the) (NN cliff-side)) (ADVP (RB narrowly))) (. .)))
They weren't sure if the hole was on the side of the cliff or not.
( They ( ( ( ( were n't ) sure ) ( ( ( if ( ( the hole ) ( was ( on ( ( the side ) ( of ( the cliff ) ) ) ) ) ) ) or ) not ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBD were) (RB n't) (ADJP (JJ sure)) (SBAR (IN if) (S (NP (DT the) (NN hole)) (VP (VBD was) (PP (IN on) (NP (NP (DT the) (NN side)) (PP (IN of) (NP (DT the) (NN cliff))))))) (CC or) (RB not))) (. .)))