A. Persistent difficulties in the social use of verbal and nonverbal communication as manifested by all of the following: Deficits in using communication for social purposes, such as greeting and sharing information, in a manner that is appropriate for the social context. Impairment of the ability to change communication to match context or the needs of the listener, such as speaking differently in a classroom than on a playground, talking differently to a child than to an adult, and avoiding use of overly formal language. Difficulties following rules for conversation and storytelling, such as taking turns in conversation, rephrasing when misunderstood, and knowing how to use verbal and nonverbal signals to regulate interaction.