The Grammar reference article from the Simple Wikipedia on 24-Jul-2004
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Grammar

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Grammar is a collection of the rules about how to speak and write well in a language.

For example, Spanish grammar is different from English grammar. They have different rules. In English we might say "I like fast cars", but in Spanish it is "me gustan los carros rapidos". The order of the words has changed: if you just translate the words (vocabulary) and not the grammar back to English, you get "I like cars fast". This is because Spanish and English have different rules about word order.