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"I hate your guts, Mother,"
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it's an unusual mother,
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"That's wonderful.
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There's a subject, verb, object.
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The whole thing's structurally fine."
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We respond to our kids like we respond to each other
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based on the message that's conveyed,
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not the grammaticality of the utterances.
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Children make grammatical mistakes all the time
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but then they go away and they go away without correction.
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So those are some basic facts.
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What do we know about the time course of language?