Regular verbs in the subjunctive

For all regular verbs (-ER, -IR, and -RE), take the 3rd person plural form (ils) of the present tense of the verb, drop the -ent ending to find the stem, and add the subjunctive endings as follows:

parler choisir rendre
Ils parlent choisissent rendent
stem parl choisiss rend
Subjunctive endings
... que je -e parle choisisse rende
... que tu -es parles choisisses rendes
... qu' il/elle/on -e parle choisisse rende
... que nous -ions parlions choisissions rendions
... que vous -iez parliez choisissiez rendiez
... qu' ils/elles -ent parlent choisissent rendent

Note that -IR verbs like sortir and partir and -RE verbs like mettre which are irregular in the present tense are regular in the subjunctive.

partir mettre
... que je parte mette
... que tu partes mettes
... qu' il/elle/on parte mette
... que nous partions mettions
... que vous partiez mettiez
... qu' ils/elles partent mettent