Sentence structure refers to the way words are arranged to create meaningful sentences. It typically includes a subject, which tells who or what the sentence is about, and a predicate, which describes what the subject does or is. For example, in the sentence "The cat sleeps," "The cat" is the subject, and "sleeps" is the predicate. There are different types of sentence structures, including simple, compound, complex, and compound-complex sentences. A simple sentence contains one independent clause, while a compound sentence combines two independent clauses with a conjunction. Complex sentences include an independent clause and one or more dependent clauses, adding depth to the meaning.