they found the lost boy 20 rninutes ago变被动语态

they found the lost boy 20 rninutes ago变被动语态 They must have lost your letter in the post 怎么变被动语态 I see the boy play 变被动语态 "Where do they sell the cars?"变被动语态 They are picking the apples 变被动语态 have they discussed the question?变被动语态? 被动语态补"to"They found the result very satisfying.转成被动时为The res They have found ways to make waste water clean.的被动语态则怎么变? 主动语态变被动语态 1.We found some jewels in a box 2.They will not pa They were cutting trees变被动语态 did they build a bridge here a year ago?改成被动语态he made the fa they built the old house over one hundred years ago改为被动语态