Stuttering Separate with hyphens . First phoneme repeats, including capitals. Repeat vowels if necessary. Refer to this: Answer: How do you punctuate stammering speech? There are exceptions. But we may be able to deal with exceptions in subbing. “Th-Thats…” (“Th” is the first phoneme, as such, it should be the one being repeated.) “Wh-What?” (Wh being the first phoneme, it should be the one repeating.)