Final answer:
In the dialogue, the appropriate form of 'estar' to fill in the blank is 'estás' because it matches the second person singular form ('tú').
Step-by-step explanation:
In the dialogue, the verb 'estar' is used to ask about someone's location. The appropriate form of 'estar' to fill in the blank is 'estás' because it matches the second person singular form ('tú'). The correct sentence would be '¿Dónde estás ayer?'
Here, 'estás' shows that the question is addressing 'you,' and 'ayer' means 'yesterday.' So, the complete dialogue is:
- ¿Dónde estás ayer?
- Yo estuve en el colegio.
Learn more about Verb conjugation