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have been mumbling

  • present perfect progressive
    of mumble.
    mumble
    verb (used without object)
    to speak in a low indistinct manner, almost to an unintelligible extent; mutter.

Example Sentences

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After that, I may not have been mumbling the right thing, but I was mumbling.

From "The Autobiography of Malcolm X" by Alex Malcolm X;Hailey

For, however Jim's soul may have been mumbling, "Help, help!" he made no audible sound.

From We Can't Have Everything by Rupert Hughes