we have used many ways to pay for things.改为被动语态

we have used many ways to pay for things.改为被动语态 We have planted many trees.改为被动语态 Have you found ways to make waste water clean?改为被动语态 改为被动语态：we must pay attention to our pronunciation to speak E We can use many things to make paper.【变为被动语态】 We sent many books to the Hope school last week改为被动语态 They used to practise speaking English together.改为被动语态 We have learned English for about sueen years（改为被动语态） Do people use knives to cut things?改为被动语态 We planted many flowers in the neighborhood改为被动语态 They have repaired many chairs today.怎么改为被动语态 We have chosen him to be the host of a charity show.(改为被动语态）