All flights were delayed yesterday due to an accident on the runway.
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The runaway delayed all flights yesterday because it caused an accident.
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Although there was an accident on the runway yesterday, no flight was delayed.
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All flights were delayed yesterday because they caused an accident to the runway.
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But for an accident on the runway, all flights wouldn’t have been delayed yesterday.
Đáp án: But for an accident on the runway, all flights wouldn’t have been delayed yesterday.
Giải thích : tình huống quá khứ được giả định ngược lại bằng câu điều kiện loại 3.
Dịch: Tất cả các chuyến bay bị hoãn do có tai nạn trên đường băng
⇒Nếu không có tai nạn trên đường băng, chuyến bay đã không bị hoãn.