when I use dictation on my macbook air, it keeps typing the same thing in a run on fashion. How do I control that?

Greetings rockdock,

Thanks for visiting the Apple Support Communities! It seems you'd like to prevent run-on sentences while using dictation with your MacBook Air.

Check out the information in the article below to insert a punctuation mark:

Dictate messages and documents on Mac - Apple Support

"To insert a punctuation mark or perform simple formatting tasks, do any of the following:

• Say the name of the punctuation mark, such as “exclamation mark.”
• Say “new line” (equivalent to pressing the Return key once) or “new paragraph” (equivalent to pressing the Return key twice). After you say “new line,” the dictated text appears when you’re done dictating."

Kind regards.