The call ended abruptly.
( ( The call ) ( ( ended abruptly ) . ) )
(ROOT (S (NP (DT The) (NN call)) (VP (VBD ended) (ADVP (RB abruptly))) (. .)))
The call did not end until the plane had stopped.
( ( The call ) ( ( ( did not ) ( end ( until ( ( the plane ) ( had stopped ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN call)) (VP (VBD did) (RB not) (VP (VB end) (SBAR (IN until) (S (NP (DT the) (NN plane)) (VP (VBD had) (VP (VBN stopped))))))) (. .)))