Some 3rd group verbs, such as partir (to leave), end as follows:

partir	to leave
je pars	I leave
tu pars	you leave
il part	he leaves
nous partons	we leave
vous partez	you leave
ils partent	they leave

NB: "pars" and "part" should be pronounced the same way. Do not pronounce final "s" or "t"

Other verbs like partir:

verb
mentir (to lie)	je mens, tu mens, il ment, nous mentons, vous mentez, ils mentent
sortir (to go out)	je sors, tu sors, il sort, nous sortons, vous sortez, ils sortent

and also: consentir (to grant), pressentir (to have a premonition about something), ressentir (to feel), démentir (to deny), repartir (to leave again), ressortir (to go out again).

Examples:

• Je pars en vacances
  I go on holiday
• Nous ressortons à 18 heures
  We go out again at 6 pm.