The flight attendants would have begun their cabin service.
( ( The ( flight attendants ) ) ( ( would ( have ( begun ( their ( cabin service ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN flight) (NNS attendants)) (VP (MD would) (VP (VB have) (VP (VBN begun) (NP (PRP$ their) (NN cabin) (NN service))))) (. .)))
The flight attendants already finished their cabin service for the morning.
( ( The ( flight attendants ) ) ( already ( ( ( finished ( their ( cabin service ) ) ) ( for ( the morning ) ) ) . ) ) )
(ROOT (S (NP (DT The) (NN flight) (NNS attendants)) (ADVP (RB already)) (VP (VBD finished) (NP (PRP$ their) (NN cabin) (NN service)) (PP (IN for) (NP (DT the) (NN morning)))) (. .)))