Verbs Subjunctive Present

http://french.about.com/od/grammar/a/subjunctive_regular.htm

To conjugate all regular verbs ending -ER, -IR, and -RE, as well as some irregular* ones, take the 3rd person plural ils form of the present tense of the verb, drop the –ent ending to find the stem, and add the subjunctive endings:

parler choisir rendre partir sortir mettre
ils parlent choisissent rendent partent sortent mettent
stem parl- choisiss- rend- part- sort- mett-
Subjunctive endings
… que je -e parle choisisse rende parte sorte mette
… que tu -es parles choisisses rendes partes sortes mettes
… qu’ il/elle/on -e parle choisisse rende parte sorte mette
… que nous -ions parlions choisissions rendions partions sortions mettions
… que vous -iez parliez choisissiez rendiez partiez sortiez mettiez
… qu’ ils/elles -ent parlent choisissent rendent partent sortent mettent
*Many verbs which are irregular in the present tense are regular in the subjunctive, including all -IR verbs conjugated like partir and sortir and -RE verbs conjugated like mettre.Other irregular verbs as well as all stem-changing verbs have irregular subjunctive conjugations.
boire envoyer prendre venir
present tense: ils boivent envoient prennent viennent
stem boiv- envoi- prenn- vienn-
Subjunctive endings
   … que je -e boive envoie prenne vienne
   … que tu -es boives envoies prennes viennes
   … qu’il/elle/on -e boive envoie prenne vienne
   … qu’ils/elles -ent boivent envoient prennent viennent
However, the nous and vous forms of the subjunctive find their stems in the present tense conjugation of nous:
present tense: nous buvons envoyons prenons venons
stem buv- envoy- pren- ven-
Subjunctive endings
   … que nous -ions buvions envoyions prenions venions
   … que vous -iez buviez envoyiez preniez veniez

This two-stem subjunctive pattern applies to all stem-changing verbs as well as all but seven irregular verbs.

Five verbs have irregular subjunctive stems but take the same endings as above:

One stem Two stems*
faire pouvoir savoir aller vouloir
stem(s) fass- puiss- sach- aill- / all- veuill- / voul-
   … que je (j’) fasse puisse sache aille veuille
   … que tu fasses puisses saches ailles veuilles
   … qu’il/elle/on fasse puisse sache aille veuille
   … que nous fassions puissions sachions allions voulions
   … que vous fassiez puissiez sachiez alliez vouliez
   … qu’ils/elles fassent puissent sachent aillent veuillent

*These two verbs have different stems for je/tu/il/ils and nous/vous.

And finally, two verbs have irregular stems as well irregular endings:

avoir être
   … que je (j’) aie sois
   … que tu aies sois
   … qu’il/elle/on ait soit
   … que nous ayons soyons
   … que vous ayez soyez
   … qu’ils/elles aient soient
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