If parents do not speak to their children at this age it can become quite difficult for them to learn the essentials of conversation. The vocabulary of a 1–2 year old should consist of 50 words and can be up to 500. Gestures that were used earlier on in development begin to be replaced by words and eventually are only used when needed. Verbal communication is chosen over nonverbal as development progresses. 2–3 years of age: Children aged 2–3 communicate best in a turn-taking style. This creates a conversational structure that makes it easier for verbal communication to develop. It also teaches patience, kindness, and respect as they learn from the direction of elders that one person should speak at a time. This creates interactional synchrony during their preverbal routines that shapes their interpersonal communication skills early on in their development. Children during this stage in their life also go through a recognition and continuity phase. Children start to see that shared awareness is a factor in communication along with their development of symbolic direction of language. This especially affects the relationship between the child and the caregiver; it is a crucial part of self-discovery for the child when they begin to take ownership over their own actions in a continuous manner. 3–5 years of age: In this age group children are still learning how to form abstract thoughts and are still communicating concretely. Children begin to be fluent in connecting sounds, syllables, and linking words that make sense together in one thought. They begin to participate in short conversations with others. Stuttering can develop, generally resulting in slowed-down speech with a few letter enunciation errors (f, v, s, z). At the beginning of this stage toddlers tend to be missing function words and misunderstand how to use verb tenses. Over time they start including functional words, pronouns, and auxiliary verbs. This is the stage at which most children can pick up on emotional cues of the tone of adults' conversation. If negative feedback is distinguished by the child, this ends with fear and avoidance of the associated verbal and nonverbal cues. Toddlers develop the skills to listen and partially understand what another person is saying and can develop an appropriate response. 5–10 years of age: Much language development during this time period takes place in a school setting. At the beginning of the school age years, a child's vocabulary