Every form of the conjugation of the Provençal verb decerni comes from the official conjugator of the Conseil de l'Écrit Mistralien. No form has been extrapolated.
The forms below are in Rhodanian Provençal. In Maritime Provençal, the first person singular takes -i: for example cante becomes canti in the present, and cantave becomes cantavi in the imperfect.
Indicative
Present
| 1st pers. sing. | decernisse |
| 2nd pers. sing. | decernisses |
| 3rd pers. sing. | decernis |
| 1st pers. plur. | decernissèn |
| 2nd pers. plur. | decernissès |
| 3rd pers. plur. | decernisson |
Imperfect
| 1st pers. sing. | decernissiéu |
| 2nd pers. sing. | decernissiés |
| 3rd pers. sing. | decernissié |
| 1st pers. plur. | decernissian |
| 2nd pers. plur. | decernissias |
| 3rd pers. plur. | decernissien |
Preterite
| 1st pers. sing. | decerniguère |
| 2nd pers. sing. | decerniguères |
| 3rd pers. sing. | decerniguè |
| 1st pers. plur. | decerniguerian |
| 2nd pers. plur. | decerniguerias |
| 3rd pers. plur. | decerniguèron |
Future
| 1st pers. sing. | decernirai |
| 2nd pers. sing. | decerniras |
| 3rd pers. sing. | decernira |
| 1st pers. plur. | decerniren |
| 2nd pers. plur. | decernirés |
| 3rd pers. plur. | decerniran |
Conditional
Present
| 1st pers. sing. | decerniriéu |
| 2nd pers. sing. | decerniriés |
| 3rd pers. sing. | decernirié |
| 1st pers. plur. | decernirian |
| 2nd pers. plur. | decernirias |
| 3rd pers. plur. | decernirien |
Subjunctive
Present
| 1st pers. sing. | decernigue |
| 2nd pers. sing. | decernigues |
| 3rd pers. sing. | decernigue |
| 1st pers. plur. | decerniguen |
| 2nd pers. plur. | decernigués |
| 3rd pers. plur. | decernigon |
Imperfect
| 1st pers. sing. | decerniguèsse |
| 2nd pers. sing. | decerniguèsses |
| 3rd pers. sing. | decerniguèsse |
| 1st pers. plur. | decerniguessian |
| 2nd pers. plur. | decerniguessias |
| 3rd pers. plur. | decerniguèsson |
Imperative
Present
| 2nd pers. sing. | decernisse |
| 1st pers. plur. | decernissen |
| 2nd pers. plur. | decernissès |
Non-finite forms
Present participle
| — | decernissènt |
Past participle
| Masculine | decerni |
| Feminine | decernido |
Infinitive
| — | decerni |
Note: in Provençal, the past participle never takes -i in the plural; it agrees only in gender (masculine / feminine).