1. Interrogative Pronouns
Words that ask questions

2. Where vs. Where Dónde – used to ask location Use the verb estar:
estoy, estás, está, estamos, están
Example:
Where are you (s. fam)?
-¿Dónde estás tú?
A dónde – used to ask where someone is going
Use the verb ir:
voy, vas, va, vamos, van
Example:
Where are you (s. fam.) going?
-¿A dónde vas tú?

3. Which vs. Which Cuál / Cuáles Which + of + noun Example:
Which of the pencils are yours?
-¿Cuáles de los lapices son tuyos?
Qué
Which + noun
Example:
Which pencil do you like?
-¿Qué lápiz te gusta?

4. What vs. What
Cuál / Cuáles – used before ser to gain general information
Example:
What is your phone number?
-¿Cuál es tu número de teléfono?
Qué – used before ser for a definition or explanation
Example:
What is Facebook?
-¿Qué es el feís?

5. How vs. What Cómo – generally is used to ask how Example: How are you?
-¿Cómo estás?
Cómo – is used as what to ask the following questions
Examples:
What is your name?
-¿Cómo te llamas?
What are you like?
-¿Cómo eres tú?

6. How much vs. How many
Cuánto – Means “How much” and is NOT the singular form of cuántos.
Example:
How much is the iphone 5c?
-¿Cuánto cuesta el iphone 5c?
Cuántos – Means “How many” and is NOT the plural form of cuánto.
Example:
How many brothers do you have?
-¿Cuántos hermanos tienes tú?
How old are you?
-¿Cuántos años tienes tú?

7. Who vs. Whose Use who when you are seeking a name.
Quién – singular form (just one person)
Quiénes – plural form (more than one person)
Examples:
Who is the pretty girl?
-¿Quién es la chica bonita?
Who are the pretty girls?
-¿Quiénes son las chicas bonitas?
Use whose when you are seeking the owner.
De quién – singular form (just one person)
De quiénes – plural form (more than one person)
Examples:
Whose cat is this?
-¿De quién es este gato?
Whose cookies are these?
-¿De quiénes son estas galletas?

8. When
Cuándo
Example:
When do you study?
-¿Cuándo estudias tú?

9. Por qué vs. porque Por qué – asks the question, “Why?”
It is two separate words and has an accent mark
Example:
Why don’t you do your homework?
-¿Por qué no haces tu tarea?
Porque – means because
It is one word, no accent marks
Example:
Because I don’t want to.
-Porque no quiero.