The imperfect subjunctive is formed by taking the 1p stem and adding the following endings. Neither the /t/ -> /t͡s/ change nor the -esc- infix occur in this tense.
1s: -asse/-esse/-isse/-pîsse
2s: -asses/-ésses/-isses/-pîsses
3s: -asse/-esse/-isse/-pîsse
1p: -assons/-essons/-issons/-pîssons
2p: -asset/-esset/-isset/-pîsset
3p: -asson/-esson/-isson/-pîsson
Sample Verbs: Smutar/Terger/Partir/Aprir/Empîr
1. Both Dar and Star are completely regular in this tense unlike most tenses
2. Potér/Venir/Tenir/Volér use the irregular stems pot-/ven-/ten-/vol-
3. Esser and Agliar are completely irregular:
1s: Fosse/Isse
2s: Fósses/Isses
3s: Fosse/Isse
1p: Fossons/Issons
2p: Fosset/Isset
3p: Fosson/Isson
Use of the Imperfect Subjunctive
The imperfect subjunctive's use is fairly similar to that of Italian:
1. After se and alongside the conditional: se fosse mistrol "if I were a boy"
2. To express the subjunctive when the main verb is in a past tense or the conditional: èra spresse che non venisses "I was sad that you didn't come"
3. To express the subjunctive when the main verb is in the present and the subjunctive verb is used in an imperfect case (habitual, ongoing etc.): me pianghe che piovesse tôte giôrne "I'm mad that it rained every day
Because the imperfect subjunctive is used alongside the present tense in the 3rd use in addition to other uses, and the past subjunctive (present subjunctive + past participle) is only used alongside the present tense in perfect cases (completed etc.), the imperfect subjunctive has also largely taken over the past subjunctive. With the exception of expressing something happen "by" another time such as in commands/orders/etc, the imperfect subjunctive can always replace the present subjunctive but the opposite is never the case.