The document discusses the different types of sentences. There are four types of sentences according to use: declarative sentences make statements, interrogative sentences ask questions, imperative sentences give commands, and exclamatory sentences express strong emotions. There are also four types of sentences according to structure: simple sentences contain one independent clause, compound sentences contain at least two independent clauses joined by coordinating conjunctions, complex sentences contain one independent clause and at least one dependent clause, and complex-compound sentences contain at least two independent clauses and one or more dependent clauses.