This document discusses the four types of sentences in English: simple, compound, complex, and compound-complex. It provides examples of each type and explains their structures. Simple sentences can follow five basic patterns: subject-verb, subject-verb-object, subject-verb-complement, subject-verb-object-object, and subject-verb-object-complement. Compound sentences join two independent clauses. Complex sentences have one independent clause and at least one dependent clause. The document also covers dependent clause types and sentence connectors.