If you are having a conversation with someone who has a speech impediment, be polite, patient, and listen carefully. If you don’t understand something the individual has said, ask them to repeat or clarify the part you don’t understand.
Maintain eye contact with the person to show your attentiveness. If their speech is slow, do not let your eyes wander around the room or let your body language communicate you’re bored.
Do not, under any circumstance, complete their sentences. This rule also holds true when you’re having a conversation with someone who does not have a speech impediment.
These are also excellent skills for children to learn so they are polite and courteous to students who have disabilities.