Which indefinite article (un, una, unas, unos)? 2

More practice on Spanish indefinite articles un, una, unos, unas. Elementary level. Includes cases where no article is needed.

📚 Quick grammar review

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When Spanish drops the indefinite article — Spanish omits the indefinite article in three main situations: after ser with an unmodified profession (Soy médico), after sin (sin coche, sin dinero), and with certain general statements (Busco piso = I'm looking for a flat). Adding an adjective brings the article back: Soy un médico muy ocupado.

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Un vs uno — before noun vs standalone — Un is always used directly before a masculine noun: un libro, un día, un café. Uno stands alone as a pronoun or in counting: Dame uno. Tengo uno. Número uno. The feminine never changes: una mesa / Dame una.

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Unos + number = approximately — Unos/unas before a number means "approximately": unos veinte minutos (about twenty minutes), unas treinta personas (around thirty people). This is a very natural Spanish way to express approximation, equivalent to más o menos.

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Fill in each of the blanks below with the correct indefinite article ("un","una","unas",or "unos").

1. an engineer = ingeniero✓

2. some colors = colores✓

3. some fences = cercas✓

4. a wire = alambre✓

5. some strings = hilos✓

6. a vacuum cleaner = aspiradora✓

7. a mouse = ratón✓

8. a (bar of) soap = jabón✓

9. some potatoes = papas✓

10. some diapers = pañales✓

11. some trays = bandejas✓

12. a library = biblioteca✓

13. a billboard = letrero✓

14. a sign = señal✓

15. a skyscraper = rascacielos✓

16. some fountains = fuentes✓

17. some bridges = puentes✓

18. a tunnel = túnel✓

19. a city block = cuadra(LA)/manzana(SP)✓

20. some parks = parques✓