Future perfect

Use the future perfect for actions that will be completed before a stated future deadline or point.

When do we use it?

Form will have plus a past participle and recognize completion by a future time.

Form

Use will have + past participle, often with by or by the time.

• By Friday, I will have finished.
• They will have left by then.

Key contrast

At B2, choose the form from the complete context: sequence, viewpoint, degree of certainty and clause structure all matter.

Common mistakes

• I will have finish by Friday. → I will have finished by Friday.
• By Friday I will finished. → By Friday I will have finished.

Remember

Use the future perfect for actions that will be completed before a stated future deadline or point.

Quick check

• Identify the time relationship or intended meaning.
• Check the auxiliary, participle and clause pattern.
• Eliminate answers that fit the words but not the context.