This document discusses different types of sentence structures: simple, compound, complex, and compound-complex. It provides examples and definitions of each type. Simple sentences contain one independent clause. Compound sentences contain two or more independent clauses joined with coordinating conjunctions, semicolons, or conjunctive adverbs. Complex sentences contain one independent and one dependent clause. Compound-complex sentences contain one dependent clause and two or more independent clauses. Exercises are included for the reader to identify sentence structures.