Sentence theory in Lithuanian grammar is a fundamental concept that plays a crucial role in understanding the structure and function of sentences in the Lithuanian language. In Lithuanian, sentences are classified into different types based on their structure and purpose.

The basic sentence consists of a subject and a predicate, which can be further divided into simple and compound sentences. Simple sentences contain one subject and one predicate, while compound sentences consist of two or more independent clauses joined together by coordinating conjunctions or punctuation marks.

In addition to these basic sentence structures, Lithuanian grammar recognizes various other sentence types, such as complex sentences, conditional sentences, interrogative sentences, and imperative sentences. These sentence types have their own unique characteristics and are used to convey different meanings and intentions.

Furthermore, Lithuanian sentence theory also includes the study of sentence elements, such as nouns, adjectives, verbs, adverbs, and conjunctions, and their roles within a sentence structure.

Overall, understanding sentence theory in Lithuanian grammar is essential for grasping the intricate rules and patterns that govern the construction of sentences in this language.