Imperfecto para el sujeto ellos/ellas/ustedes del verbo tartamudear.

tartamudear

Al declarar ellos se confundían sumamente, tartamudeaban, se sonrojaban, con tradecían sus expresiones recién formuladas, final mente Svirskis calló totalmente, sin tener lo que contestar a las preguntas formuladas por el defensor.
Their testimony was very confused. They stuttered, blushed, and contradicted their barely uttered statements. Finally, Svirskis became completely silent, not knowing how to answer the questions of the attorney for the defense.
Palabra del día
el villancico