Future Perfect Continuous
will have been + -ing for duration up to a future point.
Examples
- By May I will have been working here for 5 years.
Key rules
- Form: will have been + verb-ing
- Use it for the duration of an action up to a future point
- Usually with for and by
- Rare in everyday speech, common in formal talk about milestones
Common mistakes
- By May I will work here for ten years → By May I will have been working here for ten years
- She will have been wait → She will have been waiting
💡 Tip: Use it when you want to stress how long something will have lasted.