Interrogative Adjectives

In Spanish, interrogative adjectives are used in questions and ask the following: what?, which?, how much?, & how many?

1. “Qué” has only one form. It stays the same regardless of gender or number.
2. “Cuál” has only two forms. It does not have a different form for the feminine.
3. “Cuánto” is the only one that has 4 different forms.

masculine
singular
feminine
singular
 masculine
plural
feminine
plural
¿qué?¿qué?WHAT?/WHICH?¿qué?¿qué?
¿cuál?¿cuál?WHICH?¿cuáles?¿cuáles?
¿cuánto?¿cuánta?HOW MUCH?
HOW MANY?
¿cuántos?¿cuántas?

Examples of usage:

¿Qué libros quiere él?
¿Cuál camisa prefieres?
¿Cuántos años tiene Antonio?
What books does he want?
Which shirt do you prefer?
How old is Antonio?