The French verbs voir (to see) and croire (to believe) are alone in their group of irregular verbs, although the particularity of their conjugation makes them somewhat akin to regular but moody -yer verbs. Like those verbs, they have regular endings, but their stem has a little twist: they replace the -i with a -y in the nous and vous forms. Here’s how to conjugate these verbs:
For je, tu, il/elle, and ils/elles, drop the ending of the infinitive to get the stem (either voi- or croi-). Then add the correct choice from the following endings: -s, -s, -t and -ent.
For nous and vous, drop the ending of the infinitive to get the stem (either voi- or croi-) and change the -i in the stem to -y. Then add the ending: -ons for nous and -ez for vous, like this: nous voyons (we see) and nous croyons (we believe), and vous voyez (you see) and vous croyez (you believe).
The following tables present the complete conjugation for both voir and croire.
| je vois | nous voyons |
| tu vois | vous voyez |
| il/elle/on voit | ils/elles voient |
| je crois | nous croyons |
| tu crois | vous croyez |
| il/elle/on croit | ils/elles croient |
