Both Spanish and English have interrogative pronouns, interrogative adjectives and interrogative adverbs, and often the same word can fulfill more than one function depending on how it is used in the sentence. For example, in the Spanish sentence "¿Cuántos tienes?," meaning "How many do you have?," cuántos functions as an interrogative pronoun. But in the sentence "¿Cuántos coches tienes?," meaning "How many cars do you have?," cuántos functions as an interrogative adjective. (Similarly, in the English translation, the interrogative phrase "how many" functions as a pronoun in the first sentence and as an adjective in the second one.)
In English, the interrogative words in common use are "who," "what," "where," "when" "why" and "how." (They also can be used in noninterrogative ways.)
In Spanish, the interrogative words in common use are cómo, cuál, cuándo, cuánto, dónde, qué and quién.
Note that all the Spanish interrogative words use an orthographic accent. The same words also have noninterrogative uses, and then no accent is used.
