Keep 'em talking. I mean the worst. Because,' all forms of 'their,' words that use an apostrophe, 'very,' words ending in 'tion' you get the idea. Lousy punctuation Caps appear in the middle of words or sentences and are omitted at the front end of sentences. Periods are an after thought.
Commas are decorations.
Run-on sentences and fragments are common. Paragraphing is unheard of apart from mom's chiding and intervention. They can be made to understand the names of verbs, nouns, adjectives and the like. But you can't make them stick. Self-expression turns up in the darndest places, like lock and key diaries, on the edges of a good paper.