copiabas
-you were copying
The word copiabas is the imperfect form of copiar in the second person singular. There are other translations for this conjugation.
See the full copiar conjugation

copiar

Siempre me copiabas en historia.
You used to cheat off me in history.
Tú la copiabas a ella.
You were copying her.
Bueno, no parecía importarte que tuviera todas las respuestas cuando te copiabas de mi examen.
Oh oh, well, you didn't seem to mind that I had all the answers when you were copying off my quiz.
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