try listening to what they are talking about and dividing it into sp, so, sx categories
reposted from this
http://www.the16types.info/vbulletin/content.php/133-Instinctual-Stackings
Topics SP types might bring up in conversationt: food, dining out, dieting, nutrition, health, fitness, appearance and looks, money, savings and sales, shopping, employment, benefits, insurance, comfort, clothing, decor, interior design, strength, vitality, sickness, death, noise, discomfort, safety, security, environment, quality or durability of objects such as car, clothing, furniture, physical sciences, engineering, architecture
Topics SX types might bring up in conversation: experiences, personal likes and dislikes, emotional and mental states, excitement, elation, ecstasy, intensity, energy, attraction/repulsion, passion, connection, desire, wants and wishes, possessiveness, jealousy, beauty, attractiveness, relationships, intimacy, sex, closeness, mating, risky activities, action sports, rebelliousness (sx-first people often report having strong personal preferences)
Topics SO types might bring up in conversation: cultural and political movements and developments, popularity, popular songs books movies memes, manners, social values, societal standards, rules, guidelines, social power structures, appropriateness/inappropriateness, friendship, family, inclusion/exclusion, fashion, glamor, fame, notoriety, organizations, clubs, group divisions pertaining to nationality religion race, etc., patriotism, civic engagement, influence (so-first people sometimes refer to themselves using pronouns "we" or "us" or "our" as if they are the group)