This study is concerned with the description of compound sentences, relative clauses, and complement clauses in Standard Persian within a generative-transformational grammar. Compound sentences are divided into conjunctive, disjunctive, and adversative types on the basis of the semantic relations they express. A conjunctive clause is either non-emphatic or emphatic, a disjunctive clause is either alternative or ultimative, and an adversative clause is either contrastive (oppositive) or exceptional. Relative clauses are divided into attributive (restrictive) and appositive (non-restrictive) relative clauses with the conclusion that an attributive relative clause modifies an antecedent which has a multiple referent [-unique], while an appositive relative clause modifies an antecedent which has a unique referent [+unique]. Both relative clauses result from the reduction of a non-emphatic conjunctive compound with a coreferential noun. Ezafe constructions (Adjectival and genitive) are shown to be formed by the reduction of a non-emphatic conjunctive compound with a coreferential noun in which the second clause contains the verbs "budan" ("be"), or "dastan" ("have"). The complement clauses are analyzed as sentences that serve as an argument (supplement) to a specific class of impersonal, intransitive, and transitive verbs. (Author) intransitive, and transitive verbs. (Author)