English 被动语态 根据要求转换句型

English 被动语态 根据要求转换句型根据要求转换句型1.the book may be kept (for two weeks) 对括号内容提问_______ _______ _______the book _______ _______?2.(about one thousand) stamps have benn collected 对括号内容提问_______ _______stamps _______ _______collected?3.I saw Jack helping a blind man cross the street yesterday afternoon 改为被动语态Yesterday afternoon Jack _______ _______ _______a blind man cross the street4.you can renew the book for another week 改为被动语态The book _______ _______for another week5.Rice is grown in the south of China 用people作主语,改为主动语态_______ _______ _______in the south of China6.your homework must be handed in tomorrow morning 改为主动语态_______ _______ _______in your homework tomorrow morning