caminabais
-you were walking
The word caminabais is the imperfect form of caminar in the second person plural.
See the full caminar conjugation

caminar

Entonces, ¿qué hiciste mientras caminabais hacia el autobús?
So what did you do while you walked her to the bus?
Sí. ¿Caminabais juntas todos los días?
Yes. You walked together every day?
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