will be mumbling
-estaré mascullando
Future progressive conjugation of mumble. There are other translations for this conjugation.

mumble

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500+ learners.
Your opponents seam to have only recently got into racing and they will be mumbling far behind you.
Sus oponentes costura a solo han conseguido recientemente en las carreras y serán murmurando muy por detrás de usted.
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