Conjugation drills verbs.cat does not only provide conjugation tables and background information about Catalan verbs. Imperfect Subjunctive (-se) Welcome To Verb Graded Practice. Introduced with a preterite, imperfect, conditional, or past perfect WEIRDO verb in the independent clause, the imperfect subjunctive often refers to a previous experience, but can also refer to unlikely events or possibilities. Conjugation and use of imperfect subjunctive of irregular verbs. For specifics on when to use the subjunctive instead of the indicative, see our article on subjunctive vs. indicative. Practice conjugating irregular verbs in imperfect subjunctive-OJO: Use the Preterite root. The subjunctive is a grammatical mood (that is, a way of speaking that allows people to express their attitude toward what they are saying. Most of the Portuguese verbs end in one of the three terminations: - er, - ar or -ir and follow conjugation rules specific to each group of verbs. Present Future Imperfect Preterite Present Perfect Past Perfect Future Perfect Past Anterior Simple Conditional Conditional Perfect Affirmative Imperative Negative Imperative Present Subjunctive Present Perfect Subjunctive Future Subjunctive Future Perfect Subjuntive Imperfect Subjuntive Pluperfect Subjuntive.