Usage of 'Will have done' in English:
When we talk about what will have been achieved at a specific moment.
- We'll have been in these offices for eight years next month.
- She'll have visited ten countries in twelve days by the time she gets back.
- I'll have finished this project by Friday.
If we want to emphasize the duration of the activity, we can use the future perfect continuous form.
- I'll have been working here for 35 years by the time I retire.
- She'll have been driving for more than fifteen hours straight by the time she gets here.
- They'll have been working with us for 15 years by the end of this year.
When we predict what will have already happened by now.
- He'll have already read the report by now. Too late to change it.
- She'll have boarded her plane. It's too late to contact her.
- They'll have decided by now. We should hear the result today or tomorrow.
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