Interrogative adverbs (adverbios interrogativos) are used to ask about the place, time, manner, reason, quantity, or purpose of an action. They appear at the beginning of direct questions and are always marked with a written accent (´). The main interrogative adverbs in Spanish include:

"Dónde" is used to ask about the place of an action or event, similar to the English "where." For example:

"Dónde" can combine with certain prepositions to ask for more specific information. For example, "a dónde" asks about destination while "de dónde" asks about origin. Here are some examples:

"Cuándo" is used to ask about the time of an action, similar to the English "when." For example:

Like "dónde," "cuándo" can also combine with some prepositions to ask more specific questions. For example, "hasta cuándo" asks about duration in the future, similar to "until," while "desde cuándo" asks about duration in the past, similar to "since."

"Cómo" is used to ask about the way or the manner in which an action is performed, similar to the English "how." For example:

"Por qué" asks for the reason behind an action or situation, similar to the English "why." Here are some examples:

"Cuánto" is used to ask about quantities and corresponds with the English "how many/much," but keep in mind that "cuánto" is used invariably regardless of countability of the quantity. For example:

It can also be used with an adjective or adverb to ask about its degree. For example: