something must do,something must not do must 加to

something must do,something must not do must 加to We must do something to help her被动语态 We must do something to change their _(生活). I must do something to make my life more colorful Something must _____(do) to prevent flood from ______.(happe we must do something to stop people from______. "We must do something.This is something.Therefore,we must do must not 后面加do doing 还是to do? Must you do not We must do something( )(stop) the ( )(chemistry) factory fro there must be something you can do 中文意思是什么 you must do something to prevent your house ___ A:to be brok