Question

choose the sentence with the future perfect tense

they will have arrived by then they will be arriving by then
they will be arrived by then
they will have been arriving by then​

Answer 1

Answer:

They will be arrived by then.

This is the correct answer

Answer 2

Answer:

answwr is the first option i.e. They will have arrived by then

Explanation:

bcoz the format for future perfect is will +have +past participle form of the verb mentioned (which here is arrive) .

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hope it helps