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Some weeks after their birth, babies are able to vocalize some sounds according to their feelings. Babies cry if they are hungry or uncomfortable. But if they feel content, they will make cooing and gurgling sounds. Besides, they can distinguish the voice of their mothers among others.

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In this stage most babies are able to understand some frequently words. Furthermore, they begin to produce 1 or 2 words.

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Babies are capable to produce some words and even more. They begin to combine  words and start creating two or three "telegraphic" sentences. (by this time, they start to produce new words in order to communicate)

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In this stage, most children can ask questions, give commands, report real events, and create stories about imaginary ones, using correct word order and grammatical markers most of the time.

They develop the ability to correct the basis structure of the language and also they improve their metalinguistic control. Children are capable to understand others but also express themselves successfully.

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At this stage of life, the ability to use the language expands and grows. Learning to read gives them a major boost to metalinguistic awareness. Also, reading reinforces the understanding that a “word” is separate from the thing it represents. Children also learn about ambiguity in order to understand that words have many meanings. Finally, they begin to differentiate language register and ethnic variety.