被动句研究一直是现代汉语研究中的热点问题。被动句根据是否有形式标记可分为两大类，一类是有标记被动句，以“被”字句为代表，还包括以“叫、让、给”等介词为准被动标记的被动句；另一类是不带被动标记，与主动句形式完全相同却表示被动意义的无标记被动句。目前学界对于无标记被动句的研究还不够深入和全面，无标记被动句的范围仍未得到准确界定。本研究以三个平面的语法观为分析框架，对无标记被动句谓语部分的句法、语义、语用做了较为深入的分析和考察。

第一部分为绪论，主要对无标记被动句的研究历史做了较为详尽的梳理，总结出前人的研究成果和不足。在综述时不仅关注无标记被动句，还涉及到受事主语句、意念受动句、有标记被动句等相关句式的研究，勾勒出整个研究历史的概况并予以评论。在此基础上明确本文的研究对象、研究思路和方法。

第二部分对无标记被动句的谓语部分做句法平面的描写和分析。首先对谓语部分的句法结构做细致分类，再考察各个句法成分的构成，最后总结现代汉语无标记被动句的谓语动词的句法特征，同时还考察了无标记被动句与“作格化”问题，在描写的基础上给出相应解释。

第三部分是语义分析。具体分析了无标记被动句中谓语动词的语义特征、谓语部分的语义重心，并对无标记被动句和“被”字句的语义特征做了对比分析。

第四部分是语用分析。首先考察了无标记被动句谓语部分的信息结构，其次分析了主题和述题、主题与主语、主题与焦点之间的关系，最后总结了无标记被动句的语用功能和出现语境。

The study of Passive Sentence has been a hot topic in the field of Mandarin study all the time. The Passive Sentence in Mandarin can be divided into two categories according to whether there is a dominant mark in a sentence or not, one is named as marked passive sentence which is represented by “bei” sentence, including the sentences with other passive marks like “jiao” “rang”and “gei”; the other is named as unmarked passive sentence which doesn’t have a dominant mark, whose form has no difference with Active Sentence but express passive implication. At present, the study of unmarked passive sentence is not deep and profound enough, and the limit of unmarked passive sentence has not been precisely defined. This essay aims to do profound research and in-depth investigation on the predicate part of unmarked passive sentence in Mandarin under the instruction of the grammatical theory of “three flat surfaces” including grammar, semantic and pragmatics.

The first chapter is preface, which does a detailed summary for the history of unmarked passive sentence study, generalizing the achievements and shortcomings of previous studies. In the review, we not only focus on unmarked passive sentences, but also involve the research on related sentence patterns such as patient-subject sentences, ideal passive sentences, and marked passive sentences. On the basis of studies mentioned above, the research object, research ideas and methods of this paper are clarified.  

The second chapter describes and analyzes the syntactic plane of the predicate part of the unmarked passive sentence. Firstly, the syntactic structure of the predicate part is classified in detail, and then the composition of each syntactic component is observed. Finally, the syntactic characteristics of the predicate verb of the unmarked passive sentence in modern Chinese are summarized, and the problem of unmarked passive sentence and “ergativization” is investigated. The corresponding explanation is given based on the description.

The third chapter is semantic analysis. The semantic features of the predicate verb in the unmarked passive sentence and the semantic focus of the predicate part are specifically analyzed, and the semantic features of the unmarked passive sentence and the "bei" sentence are compared.

The fourth chapter is pragmatic analysis. Firstly, we investigate the information structure of the predicate part of the unmarked passive sentence, and then the relationship between the topic and the statement, the subject and the topic, and the subject and the focus is analyzed. Secondly, the pragmatic functions and contextual applications of unmarked passive sentences are summarized. Finally, we examine the pragmatic role of unmarked passive sentences at the discourse level.