Select the correct active form of the given sentence.

All international and domestic flights have been cancelled by the government due to the Corona crisis.

The government has cancelled all international and domestic flights due to the Corona crisis.

The correct active form of the given sentence is The government has cancelled all international and domestic flights due to the Corona crisis.

The original sentence is in the passive voice, with the subject "all international and domestic flights" and the verb "cancelled." The passive voice is formed by putting the subject of the active sentence after the verb "to be" and the past participle of the main verb. In this case, the subject of the active sentence is "the government" and the main verb is "cancel." The past participle of "cancel" is "cancelled." So, the passive form of the sentence is All international and domestic flights have been cancelled by the government due to the Corona crisis.

The active form of the sentence puts the subject of the sentence, "the government," before the verb "cancel." The verb "cancel" is followed by the direct object, "all international and domestic flights," and the prepositional phrase "due to the Corona crisis."

The other options are incorrect because:

• The government had cancelled all international and domestic flights due to the Corona crisis. is in the past perfect tense, while the original sentence is in the present perfect tense.
• The government is cancelling all international and domestic flights due to the Corona crisis. is in the present progressive tense, while the original sentence implies that the cancellation has already happened.
• The government has been cancelling all international and domestic flights due to the Corona crisis. is also in the present perfect tense, but it implies that the cancellation is an ongoing process.