Final answer:
Definite and indefinite articles play a crucial role in specifying nouns in a sentence.
Explanation:
The is a definite article used to specify a particular noun. For example, in the sentence 'Luis quiere que el profesor le ayude con la tarea,' 'el' is the definite article referring to a specific professor. In contrast, 'A' or 'An' are indefinite articles, used to refer to any member of a group or a general noun.
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