Simple, compound, and complex sentences are three basic sentence structures, and all three are described very similarly in Cambridge and Oxford style grammars. Key idea: clause types -An independent (main) clause has a subject and a finite verb and can stand alone as a complete sentence. A dependent (subordinate) clause also has a subject and verb but cannot stand alone; it is introduced by a subordinating word ( because, if, although, when, who, which, that, etc.). Understanding these two clause types is the basis for all three sentence structures. Simple sentence -Core definition (Cambridge/Oxford style): a simple sentence consists of one independent clause only; it has one finite verb phrase and no subordinate clause. It must have at least a subject and a verb, and it may include objects, complements, and adverbials, but it still counts as “simple” as long as there is only one clause. Important points for exams:A simple sen...