Have they posted the letter yet改被动

Have they posted the letter yet改被动 Have they posted the letter yet?改为被动语 Have they posted the letter yet?改为被动语态如题 Have you posted the letters yet?变被动语态 Have you posted the letters yet?改成被动语态 变被动句 have you finish the letter yet He posted the letter two hours ago.改为被动语态 I posted the letter （改为被动语态） Have you finish the letter yet? 被动语态用法a letter posted today will probably reach him the day He wrote the letter last week and posted it three days ago.改 They must have lost your letter in the post 怎么变被动语态