Final answer:
The correct imperfect conjugation of the verb 'estar' in the sentence 'Tú ______ sola ayer.' is 'estabas'.
Step-by-step explanation:
The question is asking for the correct imperfect conjugation of the verb 'estar' in the sentence 'Tú ______ sola ayer.' The correct answer is 'estabas' which is the imperfect conjugation of the verb 'estar' in the second person singular form. The imperfect tense in Spanish is used to describe ongoing or habitual actions in the past.
Learn more about Spanish verb conjugation