Future Perfect: What Will Have Happened

Learn how to talk about actions that will be finished before a future time — by 2030, by tomorrow, by the time you arrive.

Explanation

The Future Perfect describes an action that will be completed before a specific time in the future. We use it to look forward and say, "This will already be done by then."

Form: subject + will have + past participle

• By 2030, I will have finished my studies.
• She will have cooked dinner before we arrive.

Common time expressions: by, by the time, before, by next year, by 2030, by 5 p.m., by the time you arrive.

We often use the Future Perfect with a time clause (a phrase starting with "by the time" or "before"):

By the time you read this, I will have left.

Tip: Use the Future Perfect when you want to emphasise the result of a future action, not the action itself.

Examples

Here are some everyday examples of the Future Perfect:

• By next month, I will have saved €1,000 for my trip.
• She will have written three emails by lunchtime.
• By the time the film ends, we will have eaten all the popcorn.
• By 2030, scientists will have discovered new medicines.
• Don't worry — I will have finished the report before the meeting.
• By the time you wake up, I will have left for work.

Notice the structure: will + have + past participle (finished, written, eaten, discovered, left).

Common mistakes

1. Using Future Simple instead of Future Perfect.
   ❌ By 2030, I will finish my degree.
   ✅ By 2030, I will have finished my degree.
   Future Simple = the action will happen in the future. Future Perfect = the action will be complete before a future time.
2. Writing "will has" instead of "will have".
   ❌ She will has cooked dinner.
   ✅ She will have cooked dinner.
3. Using the Present Perfect by mistake.
   ❌ By tomorrow, I have finished the work.
   ✅ By tomorrow, I will have finished the work.
   "By + future time" needs Future Perfect, not Present Perfect.
4. Forgetting the past participle.
   ❌ I will have finish the work.
   ✅ I will have finished the work.

In real life

A short conversation between two friends.

Anna: What are you doing at 8 p.m. tomorrow?

Ben: I'll be at the gym. But by 9 p.m., I will have finished my workout.

Anna: Good. The film starts at 9:30. By the time we get to the cinema, I will have bought the tickets online.

Ben: Perfect. And by the end of the film, I will have eaten all the popcorn!

Anna: Don't worry — I will have saved some for you.

🔍 Can you find four examples of will have + past participle in the dialog?