slug: future-perfect title: Future Perfect group: tenses order: 11 summary: An action that will be completed before a specific future moment. formula: S + will have + V-ed/V3
When to use it
Future perfect describes an action that will be finished before a particular point in the future. The focus is on the completion of the action, not the action itself.
By Friday, I will have finished the report.
Common signal phrases: by (the time), before, by then, by next year.
Form
| Subject | Affirmative | Negative | Question |
|---|---|---|---|
| I / You / He / She / It / We / They | will have left | will not have left | will you have left? |
will have is the same for all subjects. The main verb is always in its past participle form (same as in present perfect and past perfect). will not have can be shortened to won't have.
Examples
- By the time she arrives, we will have eaten dinner.
- He will have graduated from university by June.
- Will they have fixed the road before winter?
Common mistakes
- Using the base verb instead of the past participle: "I will have finish" should be "I will have finished".
- Omitting the deadline: future perfect always implies a reference point. Without by, before, or a similar phrase, the sentence often sounds unnatural.