This article examines the role, structure, and usage of compound sentences in the English language. Compound sentences, formed by joining two or more independent clauses using coordinating conjunctions, conjunctive adverbs, or punctuation marks, are essential for expressing complex ideas clearly and coherently. The article provides a detailed analysis of the types of compound sentences, including additive, adversative, causal, and alternative structures, highlighting their function in showing addition, contrast, cause-effect relationships, and choices. It also discusses the proper grammatical construction of compound sentences and common errors made by learners, such as comma splices and run-on sentences. The article emphasizes the importance of compound sentences for maintaining clarity, coherence, and variety in both spoken and written English.

This article examines the comparative typology of sentence structures in English and Uzbek, focusing on the syntactic and morphological differences between these languages. English, a Germanic, analytic language, heavily relies on word order and auxiliary verbs to express grammatical relationships, while Uzbek, a Turkic, agglutinative language, utilizes a complex system of affixes and word-order flexibility. By comparing simple, compound, and complex sentences, this paper highlights the linguistic structures of both languages. The study reveals how typological features such as inflection, word order, and syntactic markers contribute to differences in sentence formation, providing insights into language learning, translation, and computational linguistics.

This article analyzes the Uzbek translation of the English joint sentence. Language also coexists with society, conveys changes and innovations in its life quickly and clearly, has a strong impact on their consciousness, spirituality. Compound sentences make a special contribution to the formation of language.

In this article I tried to give some information about syntax in old English and its history, compound and complex sentences in old English and  old English vocabulary.  Old English was a highly synthetic language.  It had a well-developed system of grammatical forms, which indicate the connection between words. It was originally a spoken language; therefore the written forms of the language resembled oral speech – unless the texts were literal translations from Latin. Consequently, the syntax of  the sentence was relatively simple. Coordination of clauses prevailed over subordination and complicated syntactical structures were rare.

In this article I tried to give some information about syntax in old English and its history, compound and complex sentences in old English and  old English vocabulary.  Old English was a highly synthetic language.  It had a well-developed system of grammatical forms, which indicate the connection between words. It was originally a spoken language; therefore the written forms of the language resembled oral speech – unless the texts were literal translations from Latin. Consequently, the syntax of  the sentence was relatively simple. Coordination of clauses prevailed over subordination and complicated syntactical structures were rare.