please give me the answer with example nicely.
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The representation of the way in which a sequence of words comes to be a well-formed sentence of a language. In a formal or artificial language grammar is laid down in formation rules, but the formation rules of natural languages are sufficiently complex to make accurate codification hazardous.
The basic goal of grammar is to provide an understanding of the sentence — the topmost element of the grammatical hierarchy. However, the idea of a sentence is not entirely clear-cut and defineable; for one thing, it is often difficult to say where one sentence ends and another begins. Because of this, it is best to begin doing basic grammar with a consideration of the next lower member of the hierarchy, the clause, and at a further point, to base an explanation of sentences on a prior understanding of clauses.
As you can see this can be defined in a number of ways, but none-the-less...... "grammar as form," is what make a sentence understandable. There are many different examples of a number of different rules for from. Do you have a specific structure in mind.