Choose the option that best completes the gap.
By the time the plane reaches Harare, it.............in the air twelve hours.
By the time the plane reaches Harare, it.............in the air twelve hours.
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Correct Answer: Option C
Explanation:
The sentence describes an action that will be completed by a specific time in the future: “By the time the plane reaches Harare...”
To show duration up to that future point, the correct tense is future perfect:
"will have been" or in conditional form "would have been", depending on context.
“By the time the plane reaches Harare, it would have been in the air twelve hours.”
This structure expresses that twelve hours in the air will be completed by the time the plane arrives.
The sentence describes an action that will be completed by a specific time in the future: “By the time the plane reaches Harare...”
To show duration up to that future point, the correct tense is future perfect:
"will have been" or in conditional form "would have been", depending on context.
“By the time the plane reaches Harare, it would have been in the air twelve hours.”
This structure expresses that twelve hours in the air will be completed by the time the plane arrives.