The document discusses key concepts in pragmatics and discourse analysis, including reference, presupposition, implicature, and inference. It provides definitions and examples for each concept. Reference refers to how speakers use linguistic expressions to refer to entities. Presupposition refers to assumptions speakers make about a hearer's background knowledge. Implicature involves implied meanings beyond literal meaning, based on conversational maxims. Inference in discourse analysis relies on socio-cultural knowledge rather than formal logic.