以to do为范式的不定式只能做定语和状语。意思是:要去被做。To do作定语时,定要放在名词性单元之后来修饰这个名词。如:Rock is exciting music to listen to.I have much to do/deal with.To do作状语时,即进入不定式作状语的判定流程。如:The book is easy to read.The problem is easy to work out.另外,英语被动语态的基本结构是“be+过去分词”,由此我们可以推出不定式被动式的构成即为“to be+过去分词”,如to be sold, to be studied, to be seen, to be g...