1.lucyboughtsomefruit.SomefruitwasboughtbyLucy.

　　2.unclewangwaterstheflowerseveryday.

　　TheflowersarewateredbyUncleWangeveryday.

　　3.didtheybuildthebridgein1998?Wasthebridagebuiltbythemin1998?

　　4.whendidluxunwritethesebooks?WhenwerethesebookswrittenbyLuXun?

　　5.thefamersdon'tgrowapplesonthefarm.

　　Applesarenotgrownbythefarmersonthefarm

　　6.theydidn'tcleantheclassroomyesterday.

　　Theclassroomwasnotcleanedbythemyesterday.

　　7.youcandotheworkallbyyourself.Theworkcanbedoneallbyyourself.

　　8.wemustplantmoretress.Moretreesmustbeplantedbyus.

　　9.weshoulddigalargehole.Alargeholeshouldbedugbyus.

　　10.canweputourbikeshere?Canourbikebeputhere?