帮忙检查检查主动变被动的英语句子.1：You must do this as soon as possibleThis thing must been done by you as soon as possible2:We must take good care of the childrenThe children must been taken good care of bu us 3:Students must make good use of their time in classStudent's time must been made good use of by them in class

1:This must be done as soon as possible by you 2: The children must be taken good care of by we
3:The time in class must be made good use of. must后面接动词原形

1 This must be done.....
2 The children must be taken care of by us
3 Students' time in class must be made good use of by themselves
PS: must 后面要用原型

1This thing must be done by you as soon as possible.2The children must be taken good care of bu us.3Student's time must be made good use of by them in class注意：情态动词后面加的是动词的原型.因此,must...