Question

they chewed their food slowly change into passive voice

Answer 1

Their food was slowly chewed by them
hope it helps you.........

Answer 2

T͙h͙e͙i͙r͙ f͙o͙o͙d͙ w͙a͙s͙ s͙l͙o͙w͙l͙y͙ c͙h͙e͙w͙e͙d͙ b͙y͙ t͙h͙e͙m͙,

I͓̽t͓̽s͓̽ y͓̽o͓̽u͓̽r͓̽ a͓̽n͓̽s͓̽w͓̽e͓̽r͓̽ m͓̽a͓̽t͓̽e͓̽

..................B͓̽e͓̽ t͓̽h͓̽e͓̽ b͓̽e͓̽s͓̽t͓̽