有没must to be done这种用法的?如果没,那为什么有need to be done?

有没must to be done这种用法的?如果没,那为什么有need to be done? 用Something must be done to句型造十个句子 有want to be done 这种形式吗 Justice must not only be done,but must be seen to be done Be a must to sth 有这种用法? something must to be done和something must be done区别 What must be done if wildlife protection to be succeed?回答这个问题.用英语回答..一两句话 新概念英语2级问题用must be done,can be done,should be done,have to be done,will be done这些句型造句,每种造两个,每种句型各两个 Something must be done to stop wild animals ------(kill) must to be done与must be done是一样的吗?只是后者省略to而已, 为什么要加ed以及must be done 和must be doingWe must be prepared for any eventuality.我们必须有所准备以防万一.为什么prepare要加ed?这里我没看出来有被动语态呀?must be done 和must be doing有什么区别?一个是 something must be done something must be done to ＿＿＿＿（stop) this kind of thing _______(happen) What should ____ must ____.A do,do B be done,be done C to be done ,do D do,be done 怎样使用 with+名词+to be done 的独立主格的用法英语中独立主格有没有 with+名词+to be done 的这种结构? must be must have done 区别 it must be terrible to be grown up!be的作用两个be有什么用,我没学过语法 be to be done可以改成must be done all goverment loans are to br repaid可不可以改成 all goverment loans must be repaid something must be done to pretect our enviroment.must后面为什么接done.而不能接doing请详解哦