中文摘要：

以“及物”系列变读为切入点，考察其“变读形式”所处的句法结构跟相平行的用“于／於”作标记的句法结构的异同，据此得出：“去声”的功能是把非必有论元提升至必有论元的常规位置，“于／於”则仅用于标记非必有论元，并不具备提升作用，当然以上是就域内而言。伴随着变读的衰落，这引起了一系列的变化：宾语语义角色的不断扩大、“于／於”在两汉前后的大量消失、“v＋受事＋与事”双宾结构的形成等。除此之外，亦可见“动词＋于／於＋必有论元”以表完成体的现象，它跟“于／於”是非必有论元的标记并不矛盾。

英文摘要：

Abstract： As ＂transitive＂ series of change to read as the breakthrough point, exploring the ＂read form＂ of the syntactic structure with parallel marked with Yu（于/於） the similarities and differences in syntactic structure, accordingly concluded that the function of “qusheng（去声）” is to elevate the non-obligatory argument to the normal position of obligatory argument, but Yu（于/於） is only used to mark the non-obligatory argument, will not have promote role, above is, of course, in terms of domain. With the decline of variable to read, which caused a series of changes： the object expands unceasingly, the semantic roles of Yu（于/於） disappear, before and after the Han（汉）, ＂V ＋ patient ＋ dative role＂ double -object structure formation, etc. In addition, there are some structure of ＂verb ＋ Yu（于/於） ＋ obligatory argument＂ table to perfective aspect of the phenomenon, it with Yu（于/於） is a sign of obligatory argument does not conflict.