“为”字和“被”字被动式是由基本被动式① 同化而成的。它们自身的演变为基本被动式对它们的同化创造了必要的条件。其条件有三 :( 1 )宾语是一个通常用作动词的动名词 ;( 2 )主语能够理解为宾语中那个动词的受事者 ;( 3)“为”、“被”本身是单音节、词义宽泛、词性虚脱的动词。这三个条件 ,前两个使它与基本被动式发生了结构上的接近 ,后一个使它最终被基本被动式同化为有标记的被动形式。 The word “bei” and “bei” are passive and are basically assimilated into one. Their own evolution has been basically passive, creating the necessary conditions for their assimilation. The conditions are: (1) the object is a verb that is usually used as a verb; (2) the subject can be understood as the victim of the verb in the object; (3) “as”, “being” is a monosyllable, Broad, part-of-speech verbs. These three conditions, the first two make it structurally close to the basic passive, the latter make it eventually be basically passive assimilation into a marked passive form.