将主动语态变被动语态、被动语态变主动语态.1.Thestudentscleantheclassroomeveryday.2.Mary'sroommustbekeptclean.3.Shegavemetwentyyuanlastweek.4.Hangzhouproducessilk.5.Isawamangointotheroomjustnow.还有3道

　　将主动语态变被动语态、被动语态变主动语态.

　　1.Thestudentscleantheclassroomeveryday.

　　2.Mary'sroommustbekeptclean.

　　3.Shegavemetwentyyuanlastweek.

　　4.Hangzhouproducessilk.

　　5.Isawamangointotheroomjustnow.

　　还有3道题目：

　　1.Youcan'tseethestarsinthedaytime.

　　2.Apresentwasboughtformebymysister.

　　3.MustIdoalltheexercises?

　　如果能写出每个句子的（主谓宾）就更好了。