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2 word sentences, understanding words rapidly

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Vocab spurt starts

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First words!

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Gestures, Comprehending words

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Language specific listener

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Babbling starts

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Understanding first words

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Cooing starts

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CrYiNg!

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Right use of language in different context.
Example:Being polite while talking to teaches. Taking turns speaking

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Meaning in word formation
Example: pre, -ing, -tion

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Universal sound units
Example: the sounds of the two "p" sounds in "pop-up."

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The meaning of words and sentences
Example: Man and boy mean the same thing basically but we understand the difference in age by hearing one of them.

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Rule for words to be placed to form meaningful phrases and sentences.
Example:

Incorrect - While watching a movie, people who text on their phone are very annoying.

Correct - People who text on their phone while watching a movie are very annoying.