punctuation
This isn't a "fix" but some things that I do that seem to help are:
1- Read Big Books and have the children "notice" the punctuation marks in the story and how your voice changes as you read.
2- I make a chart with the children as to the punctuation marks they noticed and what their definition is. (ex. a period is when you stop your thought. It is a long stop. a comma is a short stop but you keep on reading, a question mark is when you want someone to answer you, ... means a surprise is coming, etc.)
3- Sometimes I even type up the text of stories so each child gets a copy as I read. Again they "notice" the punctuation, sometimes circling the periods as I read.
4- I also write a story without punctuation and read it that way. Then the children come up to fix my story. The put the periods where they think they should go. I read the story exactly as they fixed it and we work as a class to "hear" the story the right way, changing what doesn't sound right.
The best thing, though, is to keep modeling correct punctuation.
Not all children will get it right away, but they will start trying it. There are also some wonderful books to use to highlight different punctuation marks that you want the students to use.
Hope this helps