A question:
Why can a five year old spell the word dinosaur?
An answer:
Because they want to.
Another question:
Why can't they spell there correctly and appropriately?
An answer:
Because there are tricks and they don't have enough experience 
to tell which one is appropriate for the context.
A question:
Why can a six year old spell tyrannosaurus rex?
An answer: 
Because they want to.
Whole language is sometimes called the language experience approach.
Comments? Questions?
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