Yes, there are theories from both pragmatics and psychology that could be relevant to the topic of the influence of parental language mode on the relationship between academic performance and disenchantment rate of middle school students.

From a pragmatic perspective, one relevant theory is Speech Act theory, which explores the ways in which language is used to perform actions, such as making requests or giving advice. This theory could be useful for examining the ways in which parents use language to communicate with their children about academic performance and disenchantment, and the effects these speech acts have on the students' attitudes and behaviors.

From a psychological perspective, there are several theories that could be relevant, including:

These are just a few examples of theories from pragmatics and psychology that could be relevant to this topic. By incorporating these theories into your research, you can gain a more nuanced understanding of the relationships between parental language mode, academic performance, and disenchantment rate of middle school students.

Yes, you can help from sperber Wilson The '"Theory of Cognition "

Theory of generative linguistics, and theory of speech ontogenesis.