In Belarusian grammar, Pronouns and Determiners play a crucial role in providing clarity, specificity, and conciseness to the language. Pronouns serve multiple functions, replacing nouns to avoid repetition and to indicate the gender, number, and case agreement with the rest of the sentence. They can be personal (я, ты, ён, etc.), possessive (мой, твой, яго, etc.), demonstrative (гэты, той, таму, etc.), interrogative (хто, што, які and their various forms), relative (які, які, каторы), indefinite (някой, некаторы, шмат, etc.), and reflexive (сам, самы).

Determiners, on the other hand, provide information about the noun by indicating its definiteness, quantity, possession, or quality. Belarusian determiners include articles (неапределены член, вызначаны член), demonstratives (гэты, той, таму), possessives (мой, ваш, яго), quantifiers (даўжыня, колькасць, некаторы), interrogatives (кацоры and their forms), and negatives (някі, нікаторы).

The correct use of pronouns and determiners is essential for clear and effective communication in Belarusian, as they ensure proper noun referencing and agreement with other parts of the sentence. Therefore, mastering the theory behind pronouns and determiners is a fundamental aspect of learning Belarusian grammar.