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The infant starts vocalizing with cooing, gurgling, sighing and laughing
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The infant responds vocally to someone who is engaging with them
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Child starts to babble, and this babble can start to resemble words, mama
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Babbling starts to resemble or mimic adult words or speech
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First words are spoken, and other words are filled in with hand gestures
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The child begins combining words on the basis or words-order rules and starts answering yes or no questions.
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The toddler begins adding bounds morphemes, uses "please" and talk about things that are wrong or missing
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Adult-like sentences begin with a subject and a verb and why questions
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Able to carry on a conversation which can include past events, reasoning, predicting expressing empathy, and creating imaginary roles, and knowledge of letter names and sounds and recognition or numbers and counting emerge.
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Ninety percent of language is formed and child begins to tell narratives that are true stories that shows a central focus with a beginning, middle and an end.
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The child begins to learn visual mode of communication with writing and reading
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Language is used to establish and maintain social status, begins to understand jokes and riddles based on sound similarities, starts defining terms and giving background information, and stories are become more developed with characters' goals, motivations, and reactions, and understanding of multiple meanings of words.
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The child understands common idioms and can acquire information from written texts.
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Child is able to give abstract dictionary definition for words and can explain meaning of proverbs in content
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The average vocabulary of high school graduate in 10,000 words and written language is more complex than spoken language.