<span class="searchmatch">collabōrābās</span> second-person singular imperfect active indicative of collabōrō...
collabōrat collabōrāmus collabōrātis collabōrant imperfect collabōrābam <span class="searchmatch">collabōrābās</span> collabōrābat collabōrābāmus collabōrābātis collabōrābant future collabōrābō...
collabora collaboramos collaboráis collaboren imperfect <span class="searchmatch">collaboraba</span> collaborabes <span class="searchmatch">collaboraba</span> collaborábemos, collaborábamos collaborabeis, collaborabais...