Voir and savoir already have their own irregularities in the present tense (see our voir, savoir & connaître lesson), and they carry that irregularity into the futur too. Envoyer throws in one more surprise.
1. Voir: stem verr-
| Je verrai mes amis ce week-end. | I'll see my friends this weekend. |
| On verra bien. | We'll see. (a very common expression) |
2. Savoir: stem saur-
| Tu sauras la réponse demain. | You'll know the answer tomorrow. |
| Nous saurons bientôt. | We'll know soon. |
3. Envoyer: stem enverr-
Watch out: envoyer is a regular -yer verb almost everywhere else, but in the futur it doesn't just become "envoierai", the stem is enverr-, with a doubled r.
| Je t'enverrai la photo. | I'll send you the photo. |
| Ils enverront le colis demain. | They'll send the package tomorrow. |
4. Conjugation: voir, savoir & envoyer
| Pronoun | Voir | Savoir | Envoyer |
|---|
| je / j' | verrai | saurai | enverrai |
| tu | verras | sauras | enverras |
| il / elle / on | verra | saura | enverra |
| nous | verrons | saurons | enverrons |
| vous | verrez | saurez | enverrez |
| ils / elles | verront | sauront | enverront |