Future perfect progressive tense

Use this tense when you want to talk about something that will happen in the future as an ongoing event, and will be finished or completed in the future:

I will have been training a lot if I manage to run the marathon in under three hours.

So here we’re talking about how, in the future, I will have completed a lot of running training if I manage to pull off a good time in the marathon. The training in the future will be an ongoing event, but is talked about as if it’s been finished or completed. This is different to the future progressive tense, which would be something like:

I will be training a lot in the future.

There’s no hint of the completion of the training in the future - it’s just an ongoing thing that will be happening in the future.

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