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Future Perfect Continuous in the Past When I left the inn I thought they would have been skiing for thirty minutes by the time I returned; but they weren't.

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Future Perfect Continuous in the Past

When I left the inn I thought they would have been skiing for thirty minutes by the time I returned; but they hadn't been.

It definitely make sense, but this is such a tricky tense, even for native speakers -- I think it might be more natural to say:

When I left the inn for an hour, I assumed my friends would have been skiing for at least half that time, but when I returned, I found out that they had never left. 

I know this is changing your sentence a lot, but I hope it helps? 

0
Is it coherent?

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