<span class="searchmatch">collabōrābant</span> third-person plural imperfect active indicative of collabōrō...
collabōrābam collabōrābās collabōrābat collabōrābāmus collabōrābātis <span class="searchmatch">collabōrābant</span> future collabōrābō collabōrābis collabōrābit collabōrābimus collabōrābitis...