一、为什么有些主动句不能改为被动句?英语句子常可以用两种语态即主动语态和被动语态来表达,句意并无改变。例如:I gave him a book.→Hewas given a book by me.或A book wasgiven tohimbyme.但是,并非所有的主动句都能改为被动句。下面几种情况均不能改。1.谓语动词是表示状 First, why can some active sentences not be changed to passive sentences? English sentences can often be expressed in two voices: the active voice and the passive voice. The meaning of the sentence does not change. For example: I gave him a book. → Hewas given a book by me. or A book wasgiven to himbyme. However, not all active sentences can be changed to passive sentences. The following situations cannot be changed. 1. The predicate verb is an indication