El libro English File – Elemental - Lección 3C

used to talk or ask about the number of things or people that are involved or concerned

cuántos, cuántas

used in questions to ask for information or for someone’s opinion

qué, cuál

used when we want to ask at what time something happens

cuándo

in what place, situation, or position

dónde

used to ask or talk about one or more members of a group of things or people, when we are not sure about it or about them

cuál

used in questions to ask about the name or identity of one person or several people

quién

used for asking the purpose of or reason for something

por qué