Respuesta :
Answer:
The answer is "tu estabas sola ayer."
Explanation:
The sentence reads "You were alone yesterday."
Estabas is correct.
Estar is the non-conjugated verb. Cannot be used unless alongside another conjugated verb.
Estas would be correct, but it is in present tense, not past.
Estoy is the yo form for estar and would not fit this sentence.
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