| A | B |
| cómo | how |
| cuál | which ONE |
| cuáles | which ONES |
| cuándo | when |
| cuánto | how much (before verb or masc. sing. noun) |
| cuánta | how much (before fem. sing. noun) |
| cuántos | how many (before masc. pl. noun) |
| cuántas | how many (before fem. pl. noun) |
| dónde | where |
| adónde | (TO) where (used with verbs of motion) |
| de dónde | (FROM) where |
| qué | what |
| quién | who (singular - refers to ONE person) |
| quiénes | who (plural - refers to MORE THAN ONE person) |
| con quién | (WITH) who |
| por qué | why |
| porque | because |