Future Tense in English

1.3. Future Perfect

Once you’ve mastered the future continuous, it’s time to learn the future perfect. The future perfect is used to talk about a completed action in the future. Here’s a look at the form:

Form

• The form of the future perfect is will/won’t + have + past participle.
• Regular past participles end in -ed.
• Irregular past participles don’t follow the common conjugation pattern.

Uses and examples

• An action that will be completed before a specific time in the future. Next September, we’ll have been married for 50 years.
• Use by or by the time to mean some time before. I’ll have finished this report by the time you’re home.

Use in, in a day’s time, in two weeks’ time, in three months’ time etc. to mean at the end of this period. In three years’ time, I’ll have completed my degree