Retentir is a french second group verb. So it follow the regular conjugation pattern of the second group like: finir
. Follow this link to see all the endings of the conjugation of the second group verbs : conjugation rules and endings for the second group verbs
Retentir is conjugated the same way that verbs that end in : -ir
The prototypical verb for the second conjugation is finir
. The conjugation is, marked by the vowel i
and the infix -iss-
in the indicative present and imperfect.