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。

1.The classroom is cleaned by the students every day.
2.We must keep Mary's room clean.
3.Twenty yuan was given to me from her last week.
4.Silk is produced in HangZhou.
5.A man was seen by me go into the room just now.

1.The classroom is cleaned by the students every day.
2.Mary must keep her room clean.
3.Twenty yuan was given me by her last week.
4.Silk is produced in Hangzhou.
5.A man was seen going into the room by me just now.

1.The students clean the classroom every day.
主 谓语 宾语
2.Mary's room must be kept clean.
3.She gave me twenty yuan last week.
主 谓 间宾 直宾
4.Hangzhou produces silk.
5.I saw a man go into the room just now
主 谓 宾
1.The classroom is cleaned by the students every day.
2.We must keep Mary's room clean.
3.Twenty yuan was given to me from her last week.
4.Silk is produced in HangZhou.
5.A man was seen by me to go into the room just now.(噶感官动词的被动语态动词前要加to)

1.the classroom was cleaned by the students every day.
2.It must keep the mary's room clean.
3.Twenty yuan was given to me by her last week.
4.Silk is produces by hangzhou
5.A man was saw to go into the room just now by me .
补充：
1.The star can't saw by you in the day time.
2.My sister brought me a present.
3.Must all the exercises were done by me?