About this time the Fasten Seatbelt sign would usually have been turned off and the flight attendants would have begun preparing for cabin service.
( ( About ( this time ) ) ( ( ( ( ( the ( Fasten ( Seatbelt sign ) ) ) ( ( would usually ) ( have ( been ( turned off ) ) ) ) ) and ) ( ( the ( flight attendants ) ) ( would ( have ( begun ( preparing ( for ( cabin service ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (RB About) (DT this) (NN time)) (S (NP (DT the) (NNP Fasten) (NNP Seatbelt) (NN sign)) (VP (MD would) (ADVP (RB usually)) (VP (VB have) (VP (VBN been) (VP (VBN turned) (PRT (RP off))))))) (CC and) (S (NP (DT the) (NN flight) (NNS attendants)) (VP (MD would) (VP (VB have) (VP (VBN begun) (S (VP (VBG preparing) (PP (IN for) (NP (NN cabin) (NN service))))))))) (. .)))
Around this time 30 minutes after takeoff sign, the fasten seatbelt sign would have been turned off and the flight attendants would have begon cabin service.
( ( Around ( ( ( this time ) ( 30 minutes ) ) ( after ( takeoff sign ) ) ) ) ( , ( ( ( ( ( the ( fasten ( seatbelt sign ) ) ) ( would ( have ( been ( turned off ) ) ) ) ) and ) ( ( the ( flight attendants ) ) ( would ( have ( begon ( cabin service ) ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN Around) (NP (NP (DT this) (NN time)) (NP (CD 30) (NNS minutes)) (PP (IN after) (NP (NN takeoff) (NN sign))))) (, ,) (S (NP (DT the) (NN fasten) (NN seatbelt) (NN sign)) (VP (MD would) (VP (VB have) (VP (VBN been) (VP (VBN turned) (PRT (RP off))))))) (CC and) (S (NP (DT the) (NN flight) (NNS attendants)) (VP (MD would) (VP (VB have) (NP (JJ begon) (NN cabin) (NN service))))) (. .)))