French regular verbs are generally grouped in three classes or conjugations ending in "ER" (1st class), "IR" (2d class), and others like "RE", "IRE", "OIR" (3d class).

                OTHER VERBS ENDING IN "RE" and "IRE". (third class)

Note: Those verbs take generally "s", "s", "t" or "d" and "ons", "ez", "ent" when they are conjugated with personal pronouns (subject).

VERBS ENDING IN "RE". (third class)

Example:

                                 ROMPRE         to break

                                        Indicative present

            je romps                                   nous rompons

            tu romps                                   vous rompez

     il / elle rompt                             ils / elles rompent

                                 TENDRE         to stretch , to tighten

                                        Indicative present

           je tends                                    nous tendons

           tu tends                                    vous tendez

    il / elle tend     tendt (error)       ils / elles tendent

Note that verbs ending in "DRE" take "d" at the third person singular (il / elle).

VERBS ENDING IN "IRE".  (third class)

Example:

                                     CUIRE          to cook

                                        Indicative present

            je cuis                                  nous cuisons

            tu cuis                                  vous cuisez

     il / elle cuit                            ils / elles cuisent

                                   CONDUIRE          to conduct , to drive

                                        Indicative present

          je conduis                             nous conduisons

          tu conduis                             vous conduisez

   il / elle conduit                       ils / elles conduisent

                                       RIRE            to laugh

                                         Indicative present

          je ris                                    nous rions    risons (error)

          tu ris                                    vous riez      risez (error)

   il / elle rit                              ils / elles rient     risent (error)

                                        SOURIRE         to smile

                                         Indicative present

          je souris                             nous sourions      sourisons (error)

         tu souris                              vous souriez        sourisez (error)

  il / elle sourit                        ils / elles sourient       sourisent (error)