Final answer:
Complete sentences in English do not include commas. Commas are used to separate elements within a sentence, but not within a complete sentence.
Step-by-step explanation:
Complete sentences in the English language do not ever have commas included in them. Commas are used to separate different elements within a sentence, such as items in a list or clauses. However, a complete sentence should not have a comma interrupting the main clause. For example, 'She likes to walk, and he likes to run.' is not a complete sentence because the comma interrupts the main clause. It should be written as 'She likes to walk and he likes to run.' to form a complete sentence without a comma.
Learn more about Commas in complete sentences