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Unless the problem were serious, they wouldn't have delayed the flight for so long. |
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If there had been no problem with the aircraft, they wouldn't have delayed take-off like that. |
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The flight was postponed indefinitely, so we presumed there was engine-trouble. |
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We began to feel that there might be a real problem with the aircraft as take-off was continually being delayed. |
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We assumed that, since there was a problem with the aircraft, they were obliged to delay takeoff indefinitely. |