In Hindi Grammar, Sentence Structure Theory refers to the study of how sentences are formed and organized in the Hindi language. It focuses on understanding the rules and principles that govern the arrangement of words and phrases to create meaningful and grammatically correct sentences.

Hindi sentences typically follow a subject-object-verb (SOV) order, which means that the subject usually comes first, followed by the object, and the verb comes at the end. However, this order can be modified for emphasis or stylistic reasons.

Sentence Structure Theory in Hindi Grammar also covers different types of sentences, such as affirmative, negative, interrogative, and imperative sentences. It explores the rules for forming these sentences and the appropriate use of verb conjugations, tense markers, and question particles.

Furthermore, Sentence Structure Theory examines the role of case markers in Hindi sentences, which are used to indicate the grammatical function of nouns, pronouns, and adjectives in relation to other words in the sentence.

Overall, understanding Sentence Structure Theory is crucial for learners of Hindi to grasp the fundamental principles and patterns that govern sentence formation in the language.