Final answer:
To write the correct indefinite articles in Spanish, use 'un' for masculine singular nouns and 'una' for feminine singular nouns. Add an 's' to make them plural.
Step-by-step explanation:
To write the correct indefinite articles in Spanish, you need to consider the gender and number of the nouns. For masculine singular nouns, the indefinite article is 'un'. For feminine singular nouns, the indefinite article is 'una'. To make these nouns plural, you add an 's' at the end. For example, 'vecina' (neighbor) becomes 'unas vecinas' (some neighbors). 'Doctora' (doctor) becomes 'unas doctoras' (some doctors).
Learn more about Spanish indefinite articles