<span class="searchmatch">calificaba</span> first/third-person singular imperfect indicative of calificar...
<span class="searchmatch">calificabas</span> second-person singular imperfect indicative of calificar...
calificásvos califica calificamos calificáis califican imperfect <span class="searchmatch">calificaba</span> <span class="searchmatch">calificabas</span> <span class="searchmatch">calificaba</span> calificábamos calificabais calificaban preterite califiqué...