Resultados posibles:
comprobabas
-you were checking
Imperfecto para el sujeto del verbo comprobar.
comprobabas
-you were checking
Imperfecto para el sujeto vos del verbo comprobar.

comprobar

En los viejos tiempos, comprobabas el peso.
Old days, you check weight.
¿Por qué lo comprobabas?
Why were you checking?
¿Por qué lo comprobabas? Porque me lo pidió y David Lee no iba a hacerlo.
Why were you checking? Because he asked me to and David Lee wouldn't.
Palabra del día
el acebo