把主动语态改成被动态students must clean their classriom every day

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• 把主动语态改成被动态students must clean their classriom every day
• 将主动语态变被动语态、被动语态变主动语态.1.The students clean the classroom every day.2.Mary's room must be kept clean.3.She gave me twenty yuan last week.4.Hangzhou produces silk.5.I saw a man go into the room just now.还有3道题目：1.You can't see the stars in the daytime.2.A present was bought for me by my sister.3.Must I do all the exercises?如果能写出每个句子的（主谓宾）就更好了。
• 谁能帮我一下,把句子改成被动语态1：Jim ofen reads English magazines after shool.2:Every day these students do mach homework.3:Each of thern koows the girl in red under the big tree.4:These worker don't build houses.5:Li Xiang often helps me with my English.6:The studens of Class the clean the shool yard.7:We usually don't eat meat for breakfast.8:Mary writes a composition a week.9:Does John water the flowers in the graden?10:Who often sings songs in the room.
• 把主动语态改成被动态students must clean their classriom every day
• 用一根铁丝围成一个边长是8cm的正方形，如果把它拉成一个平行四边形，面积就减少12cm2，拉成的平行四边形的高是_cm．
• 用一根铁丝围成一个边长是8cm的正方形，如果把它拉成一个平行四边形，面积就减少12cm2，拉成的平行四边形的高是_cm．