Manger → mangeons. Commencer → commençons. Nettoyer → je nettoie. At first these look like a pile of exceptions you have to brute-force. They're not. Every one of them follows a single logic: French is protecting a soft consonant sound from a vowel that would otherwise harden it. Learn that logic once and you never memorize these individually again.

Part of the series French Conjugation Memory Tricks.

The one rule behind -cer and -ger

French has a pronunciation fact baked into its spelling:

c and g are soft before e, i, y — and hard before a, o, u.

  • Soft c = an s sound (ce, ci). Hard c = a k sound (ca, co, cu).
  • Soft g = the j/"zh" sound (ge, gi). Hard g = "go" (ga, go, gu).

Now look at the troublesome endings. The ones that cause spelling changes all start with a or o:

  • -ons (nous, present): starts with o
  • the imparfait endings -ais, -ait, -aient: start with a

When a soft c or g verb meets one of those, the vowel would harden the consonant — turning commenc- into a k sound. French refuses to let the pronunciation drift, so it patches the spelling.

-ger verbs: keep an extra e

manger, nager, voyager, ranger, changer. Insert a silent e before the hard vowel to keep g soft:

nous mangeons (not mangons) je mangeais, tu mangeais, il mangeait, ils mangeaient (imparfait)

The e is doing one job: standing between the g and the o/a so the g stays "zh."

-cer verbs: add a cedilla ç

commencer, placer, lancer, avancer, prononcer. Add the cedilla to keep c soft:

nous commençons (not commencons) je commençais, il commençait, ils commençaient (imparfait)

The little hook is the soft-c sound, written down.

Notice where it does and doesn't happen

The change appears only before a/o endings. In forms with e/i endings, the consonant is already soft, so nothing changes:

nous mangeons (needs the e) — but vous mangez (already soft, no change) nous commençons (needs the cedilla) — but vous commencez (already soft, no change)

So you're not watching every form — just the nous present and the a-starting imparfait forms.

-yer verbs: y → i before a silent ending

A related pattern, different motivation. Verbs in -yer (payer, employer, nettoyer, envoyer, essuyer) change y to i when the ending is silent — which is exactly the boot forms:

je paie, tu paies, il paie, ils paient (silent endings → i) nous payons, vous payez (pronounced endings → keep y)

If that boot shape rings a bell, it should — -yer verbs are a boot verb family. The stem changes inside the boot (je paie) and reverts outside it (nous payons).

-ayer exception: for verbs ending in -ayer (payer, essayer), both spellings are correct: je paie or je paye. For -oyer and -uyer (nettoyer, essuyer), the y → i change is *mandatory: je nettoie, never je nettoye.

Why "understand the why" beats "memorize the list"

If you memorize mangeons and commençons as isolated exceptions, you'll forget them, and you'll have no idea what to do with a brand-new verb like déménager or rincer. But if you internalize the rule — protect the soft sound — then any new -ger or -cer verb is instantly solvable. You don't recall the answer; you regenerate it from the principle. That's the difference between memorizing and understanding, and it's why these "irregular" verbs are actually the most logical in French.

Drill plan

  1. Say the soft/hard rule aloud: "c and g are soft before e, i, y; hard before a, o, u." Ten seconds, and it explains every case.
  2. Conjugate -ger and -cer verbs as full sets, watching the nous form and the imparfait — that's where the patch appears.
  3. Type the cedilla and the kept e. A drill that lets you skip them isn't testing the thing that matters.
  4. File new verbs by family the moment you meet them.

These spelling-change verbs sit right next to the boot verbs and the endings cheat sheet — all three are really about sound, not memorization.

FAQ

Why does manger become mangeons?

To keep the g soft. In French, g is soft (like the s in measure) before e, i and y, but hard (like go) before a, o and u. The nous ending -ons starts with o, which would harden the g, so French keeps an e (mangeons) to protect the soft sound.

Why does commencer become commençons?

To keep the c soft. C is soft (like s) before e, i and y but hard (like k) before a, o and u. The nous ending -ons would harden it, so a cedilla is added (ç) to keep the soft s sound: commençons, not commenkons.

What is the rule for -yer verbs in French?

Verbs ending in -yer (payer, employer, nettoyer) change y to i before a silent ending, that is in the boot forms (je paie, tu paies, il paie, ils paient) but not in nous payons / vous payez. For -ayer verbs both spellings (je paie / je paye) are accepted.