Get their attention. Say their name, move closer to their “good” side, or touch their arm or shoulder. Keep eye contact so they can see your facial expressions and body language.
Speak clearly and naturally. Keep your hands away from your mouth so your mouth is visible and your sounds carry. Avoid exaggerating, and don’t shout or mumble because this distorts your words. Make sure to speak at a normal pace and pause in between sentences so they can process what you are saying.
Be visible. The person you’re speaking to may be accustomed to reading lips, so make sure you are in good lighting so they can see your face clearly.
Eliminate background noise. If you’re in a restaurant, ask to be seated away from the entrance door or large groups. If at home, step into a quieter room or away from other conversations.