This document discusses the four main types of sentences in English: simple, compound, complex, and compound-complex. It provides examples and explanations of each type. Simple sentences contain one independent clause. Compound sentences contain two or more independent clauses joined with coordinators, conjunctive adverbs, or semicolons. Complex sentences contain one independent clause and one or more dependent clauses, which can be adverb, adjective, or noun clauses. Compound-complex sentences contain at least three clauses, with at least two being independent clauses.