Resultados posibles:
testificabas
-you were testifying
Imperfecto para el sujeto del verbo testificar.
testificabas
-you were testifying
Imperfecto para el sujeto vos del verbo testificar.

testificar

Me di cuenta de lo que realmente me importa mientras testificabas.
I learned what really matters to me while you were up there.
Palabra del día
la rebaja