Sentence Structure Theory in Finnish grammar is based on the understanding that sentences are composed of different syntactic elements arranged in a specific order. Finnish is an agglutinative language, which means that words are formed by adding affixes to stems. This characteristic heavily influences the structure of Finnish sentences.

In Finnish grammar, the sentence structure is typically subject-verb-object (SVO), although other word order variations are possible due to the flexible nature of Finnish. However, the word order can change depending on the intended emphasis or stylistic choice of the speaker or writer.

The basic structure of a Finnish sentence consists of a main clause, which contains a subject, a verb, and an object. However, additional clauses, phrases, and modifiers can be added to provide more information or to enhance the meaning of the sentence.

Understanding the sentence structure in Finnish grammar is essential for effectively conveying meaning and producing grammatically correct sentences. By studying the rules and patterns of sentence structure, learners of Finnish can develop their language skills and communicate more fluently and accurately.