French IR Verb Conjugation: Master Regular 2nd Group & Irregular Verbs

When studying French, verbs ending in -ir often present a puzzling challenge for learners. You might learn that finir conjugates with specific endings, only to discover that partir, venir, or ouvrir follow completely different patterns.

Why does this happen? In French grammar, -ir verbs fall into two separate categories: regular 2nd group verbs and irregular 3rd group verbs.

In this comprehensive guide from my-french.com, you will discover how to instantly tell them apart, master the regular conjugation rules, and categorize irregular verbs into easy-to-remember patterns.

1. The "Nous" Secret: How to Identify 2nd vs. 3rd Group Verbs

Before conjugating an -ir verb, you must determine its group. Fortunately, there is an easy diagnostic test using the present tense nous form or the present participle (participe présent).

  • Group 2 Verbs (Regular -IR): Feature an -iss- stem extension in plural forms (nous, vous, ils/elles) and end in -issant in the present participle.
  • Example: Finir → Nous finissons / finissant (Regular 2nd group).
  • Group 3 Verbs (Irregular -IR): Do not use the -iss- sound.
  • Example: Partir → Nous partons (never partissons) / partant (Irregular 3rd group).

If you hear the "-iss" sound with nous, you have a standard regular 2nd group verb.

2. Regular 2nd Group French -IR Verbs

Regular -ir verbs are predictable. To conjugate them in the present indicative, remove the -ir infinitive ending to find the stem, then append the standard endings.

Present Tense Endings

  • Je: `-is`
  • Tu: `-is`
  • Il / Elle / On: `-it`
  • Nous: `-issons`
  • Vous: `-issez`
  • Ils / Elles: `-issent`

    • Conjugation Example: Finir (To finish)

  • Je finis (I finish)
  • Tu finis (You finish)
  • Il / Elle / On finit (He / She finishes)
  • Nous finissons (We finish)
  • Vous finissez (You finish)
  • Ils / Elles finissent (They finish)

    • Essential Regular -IR Verbs to Memorize

  • Choisir (to choose): Nous choisissons
  • Réussir (to succeed): Nous réussissons
  • Grandir (to grow up): Nous grandissons
  • Obéir (to obey): Nous obéissons
  • Réfléchir (to reflect/think): Nous réfléchissons
  • Remplir (to fill): Nous remplissons

    • 3. Irregular 3rd Group -IR Verbs (Grouped by Patterns)

Irregular -ir verbs do not take -iss-. While they are classified as irregular, they actually follow three predictable sub-patterns.

Sub-Pattern 1: The "Drop-the-Consonant" Verbs (Partir, Dormir, Sortir)

For the singular forms (je, tu, il), drop the last consonant of the stem and add `-s, -s, -t`. For the plural forms, restore the consonant and use standard endings `-ons, -ez, -ent`.

  • Je pars
  • Tu pars
  • Il / Elle part
  • Nous partons
  • Vous partez
  • Ils / Elles partent

    • Example: Partir (Stem: part-)

Other verbs in this group: dormir (je dors / nous dormons), sortir (je sors / nous sortons), servir (je sers / nous servons), sentir (je sens / nous sentons).

Sub-Pattern 2: The "ER Impostors" (Ouvrir, Offrir)

These verbs end in -ir, but they masquerade as -er verbs. They take regular 1st group endings (`-e, -es, -e, -ons, -ez, -ent`) in the present tense!

  • J'ouvre
  • Tu ouvres
  • Il / Elle ouvre
  • Nous ouvrons
  • Vous ouvrez
  • Ils / Elles ouvrent

    • Example: Ouvrir (To open)

Other verbs in this group: offrir (to offer), couvrir (to cover), découvrir (to discover), souffrir (to suffer).

Sub-Pattern 3: Stem-Changing Verbs (Venir & Tenir)

These high-frequency verbs change their root vowel from e to ie in singular forms and the third-person plural, while taking standard endings with nasal accents.

  • Je viens
  • Tu viens
  • Il / Elle vient
  • Nous venons
  • Vous venez
  • Ils / Elles viennent

    • Example: Venir (To come)

Other verbs in this group: devenir, revenir, tenir, maintenir, appartenir.

4. Quick Comparison Cheat Sheet

5. Proven Tips to Master French -IR Verbs

Verb Pattern Type Singular (Je) Plural (Nous) Plural (Ils)
:--- :--- :--- :--- :---
Finir Regular 2nd Group Je finis Nous finissons Ils finissent
Sortir 3rd Group (Short stem) Je sors Nous sortons Ils sortent
Ouvrir 3rd Group (-ER style) J'ouvre Nous ouvrons Ils ouvrent
Tenir 3rd Group (Stem-change) Je tiens Nous tenons Ils tiennent

1. Learn in clusters: Do not study obtenir, retenir, and soutenir separately; associate them all with the root pattern of tenir.

2. Listen for pronunciation: Notice how ils finissent ends with an audible [is], whereas ils partent ends with [art]. Pronunciation reinforces grammar memory.

3. Practice with daily phrases: Write down simple sentences like « Je finis mon travail » or « Nous partons en vacances » to lock in the correct stems instinctively.

By organizing French -ir verbs into these structured patterns, you transform an intimidating list of exceptions into logical, manageable grammar rules.