This document discusses key concepts in semantics including referring expressions, predicates, and arguments. It defines referring expressions as any expression that refers to something or someone. Predicates are words or phrases that can function as the main verb of a sentence, such as "hungry" or "asleep". Arguments are the individual entities that fill roles in predicates, expressed through referring expressions. Several examples are provided to illustrate these concepts. Practices questions with answers are included to help distinguish referring expressions, predicates, and arguments in example sentences. Contexts that can affect meaning like opaque contexts and equative sentences are also examined.