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had been mistaking

  • past perfect progressive
    of mistake.
    mistake
    noun
    an error in action, calculation, opinion, or judgment caused by poor reasoning, carelessness, insufficient knowledge, etc.

Example Sentences

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She had been mistaking him for a nice, ornamental, useless boy.

From The Lion's Share by Arnold Bennett

What we had been mistaking for fleeting glimpses of sky away aloft there, were really patches of the Blumis's snowy crest caught through shredded rents in the drifting pall of vapor.

From A Tramp Abroad — Volume 05 by Mark Twain