<span class="searchmatch">extābuerim</span> first-person singular perfect active subjunctive of extābēscō...
extābēscerēs extābēsceret extābēscerēmus extābēscerētis extābēscerent perfect <span class="searchmatch">extābuerim</span> extābuerīs extābuerit extābuerīmus extābuerītis extābuerint pluperfect...