Stem-changing -er verbs feel random until you see the shape. Why j'achète but nous achetons? Why j'appelle but vous appelez? It looks like the verb can't make up its mind. It can — and the change happens in exactly the same four places every single time. Once you can picture those four places, the whole category becomes automatic.

That picture is a boot.

Part of the series French Conjugation Memory Tricks.

Draw the boot

Write out the six present-tense forms in the usual order:

je          nous
tu          vous
il/elle     ils/elles

Now outline the forms that change their stem: je, tu, il/elle, and ils/elles. Leave out nous and vous. Trace the outline and you get a boot (some teachers call it an L, or a "shoe"):

┌──────────┐
│ je       │  nous
│ tu       │  vous
│ il   ┌───┘
│ ils  │
└──────┘

Inside the boot, the stem changes. Outside it (nous, vous), it stays like the infinitive. That's the entire rule.

The four boot families

The boot tells you where the change happens. The verb's spelling family tells you what the change is.

1. è verbs: the vowel opens up

acheter, lever, mener, peser, promener. A hidden e becomes è inside the boot:

j'achète, tu achètes, il achète, ils achètent but nous achetons, vous achetez

2. Double-consonant verbs

appeler, jeter, rappeler, épeler. Instead of an accent, these double the consonant inside the boot:

j'appelle, tu appelles, il appelle, ils appellent but nous appelons, vous appelez

3. é → è verbs

préférer, espérer, répéter, célébrer. An é opens to è inside the boot:

je préfère, tu préfères, il préfère, ils préfèrent but nous préférons, vous préférez

4. -yer verbs: y → i

payer, employer, nettoyer, envoyer. The y becomes i inside the boot:

je paie, tu paies, il paie, ils paient but nous payons, vous payez

(For -ayer verbs like payer, the y form is also accepted — je paye — but the boot version is safest.)

Why the boot exists (so you never forget it)

This isn't arbitrary. The boot is a map of where the stress lands when you say the word.

  • In nous achetons and vous achetez, the ending is pronounced, so the stress pulls onto the ending. The stem vowel stays weak and quiet: ach'-tons.
  • In j'achète, the ending is silent, so the stress has nowhere to go but the stem. The vowel opens up to carry it: a-SHET.

The accent or doubled consonant is just French spelling the sound it's already making. Say the forms out loud and you'll hear the boot before you draw it.

How to drill it so it sticks

  1. Always conjugate boot verbs as a set of six, out loud, so you feel the nous/vous dip back to the plain stem. Isolated forms hide the pattern.
  2. Type the accents. The whole point of these verbs is the è / doubled letter / i — a drill that lets you skip the accent isn't testing the thing that matters.
  3. Sort new verbs into one of the four families the first time you meet them. "Mener? That's an è verb, same as acheter." Filing it under a family means you never re-learn it.

Boot verbs are one of four spelling patterns covered in the French verb endings cheat sheet — and they pair naturally with the spelling-change verbs (-cer / -ger), which protect a sound the same way the boot protects a stress.

FAQ

What are boot verbs in French?

Boot verbs are stem-changing -er verbs (acheter, appeler, jeter, préférer, lever) whose stem changes in the je, tu, il/elle and ils/elles forms but NOT in nous and vous. When you outline the changed forms on a conjugation table, they form a boot or L-shape, which is where the name comes from.

Which French verbs are boot verbs?

Common ones include acheter, lever, mener, peser (è change), appeler, jeter (double consonant), préférer, espérer, répéter (é→è), and -yer verbs like payer, employer, nettoyer (y→i). They all share the boot pattern: changed stem everywhere except nous and vous.

Why don't nous and vous change in boot verbs?

Because the nous and vous endings (-ons, -ez) are pronounced and pull the stress onto the ending, so the stem vowel stays in its weak form (nous achetons). In the boot forms the ending is silent, so the stress falls on the stem and the vowel opens up (j'achète). The boot is really a map of where the stress lands.