<span class="searchmatch">collabōrāvisset</span> third-person singular pluperfect active subjunctive of collabōrō...
collabōrāverītis collabōrāverint pluperfect collabōrāvissem collabōrāvissēs <span class="searchmatch">collabōrāvisset</span> collabōrāvissēmus collabōrāvissētis collabōrāvissent passive present...