I understand it, I know it- but I can't say it

This week we are talking about language and math pathways. Zadina talks about students that struggle with issues such as knowing information, but are unable to say it or pronounce a sound or have trouble remembering math formulas. Have you had an experience with a student that has exhibited a problem discussed in the chapter? How did the student behave? What id you believe the problem to be at the time? How did you address it then? What would you do differently now?