<span class="searchmatch">scīscerem</span> first-person singular imperfect active subjunctive of scīscō...
present scīscam scīscās scīscat scīscāmus scīscātis scīscant imperfect <span class="searchmatch">scīscerem</span> scīscerēs scīsceret scīscerēmus scīscerētis scīscerent perfect scīverim...