Possible Results:
estabas contribuyendo
-you were contributing
Imperfect progressive conjugation of contribuir.
estabas contribuyendo
-you were contributing
Imperfect progressive vos conjugation of contribuir.

contribuir

El número de páginas web era todavía tan pequeño que podías organizarlas por índices temáticos. Sentías que estabas contribuyendo a la grandeza cada vez que creabas una página web o publicabas un comentario.
The number of webpages was still small enough that you could organise them in topic indexes, and you had the feeling that you were contributing to its greatness every time you created a webpage or posted a comment.
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to pour