<span class="searchmatch">collāberer</span> first-person singular imperfect active subjunctive of collābor...
collābāris, collābāre collābātur collābāmur collābāminī collābantur imperfect <span class="searchmatch">collāberer</span> collāberēris, collāberēre collāberētur collāberēmur collāberēminī collāberentur...