Mary mmust keep her room clean. You can't see the stars in the daytime. .变被动语态

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• Mary mmust keep her room clean. You can't see the stars in the daytime. .变被动语态
• 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。
• Mary mmust keep her room clean. You can't see the stars in the daytime. .变被动语态
• Do you often clean your room?改为被动语态
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