My 3yr old boy does not talk or understand what we say?

My son has been in speech therapy for a couple months to no improvement, I'm not sure if going to speech therapy again will be any help. I have no idea what may be the problem, I'm waiting to get him to preschool in September so I hope that will help. What can I do to help him talk or find out what is the... show more My son has been in speech therapy for a couple months to no improvement, I'm not sure if going to speech therapy again will be any help. I have no idea what may be the problem, I'm waiting to get him to preschool in September so I hope that will help. What can I do to help him talk or find out what is the problem? He doesn't understand when we tell him no, or simple instructions.
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