请修缮这段文字要求表达要清晰语法要准确。As a kind of advertisement public service announcement does not aim at making profits but aims at promoting moral norms promote social integrity help the public form a correct outl

Public service announcements are a type of advertisement that does not aim to make profits, but rather aims to promote moral norms, social integrity, and a correct outlook on life and values. They advocate for a harmonious society and serve as a powerful force to transmit positive energy to society. Public service announcements are crucial in the construction of spiritual civilization and are a driving force for social development and civilization. With the development of network technology, public service announcement language has become more abundant, and its new contents and characteristics have become the focus of linguistic academic research.

This paper analyzes public service announcement language from the perspective of speech act theory and studies the speech act of public service announcement. The literature analysis and case analysis methods are used to specifically analyze the prediction, enrich the relevant papers' research of speech act, provide references for the relevant research on public service announcement language, and draw conclusions.

The introduction section explains the reason, purpose, significance, research route, and expected results of the topic selection. The second chapter uses the method of literature analysis to elaborate on the research status of public service announcement language and the concepts of related theories. This provides a reference for the specific analysis of public service announcement language in this paper. The third chapter describes how the author uses research methods to make a concrete analysis of this paper, allowing public service announcement language to better achieve its persuasiveness and enhance the advertising language's publicity effect.

The fourth chapter mainly discusses the classification of public service announcement language from the perspective of speech act. It is divided into expository, directive, commitment, and expression categories. The chapter uses a large number of examples to fully illustrate the application of speech act in public service announcement language. Finally, the paper summarizes the analysis results and provides suggestions