Question

Choose the sentence which is in the future perfect tense. *
a.They will have arrived by then.
b.They shall be arriving by then.
c.They will arrive by then.
d. They shall have been arriving by then

Answer 1

Among the given options, the sentence ''They will have arrived by then.'' is the future perfect tense.

Structure of future perfect tense:

Subject + will have + past participle + object

• ''They will have arrived by then.'' is in the form of the future perfect tense.
• ''They shall be arriving by then.'' is in the form of the future continuous tense.
• ''They will arrive by then.''  is in the form of the future indefinite tense.
• '' They shall have been arriving by then'' is in the form of the future perfect continuous tense.

Hence, option (a) is the required answer.