Question

Change to future perfect tense.

The guests will arrive by lunch.

Answer 1

The answer to your question is:

The guests will have arrived by lunch.

For future perfect tense,

we first add the subject (the guests) and then will+have+ V3 form of the verb (arrive to arrived) then remaining lines as followed (by lunch).

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Answer 2

The guests will have arrived by lunch.

• When converting the given sentence into the future and perfect tense, 'will', 'have', and the verb's past form have to be included in the sentence.
• The required verb will become 'arrived' after adding 'ed' to change it into its second form.
• So, the appropriate sentence is - 'The guests will have arrived by lunch.'
• It means that by the time they will have lunch, their guests will have arrived.