<span class="searchmatch">collabōrāvērunt</span> third-person plural perfect active indicative of collabōrō...
collabōrāvī collabōrāvistī collabōrāvit collabōrāvimus collabōrāvistis <span class="searchmatch">collabōrāvērunt</span>, collabōrāvēre pluperfect collabōrāveram collabōrāverās collabōrāverat...