How many irregular present tense verbs are there in French?
If a verb is irregular, it is irregular in all tenses. I remember reading that 90% of all verbs are regular, but I’m guessing this proportion is increasing thanks to all the new verbs coming into the language through technology. Still, 10% is a LOT more that 10 verbs. It’s probably closer to 1000. Irregular verbs are generally either older and out of use verbs, or else the most common. Most conjugation books will present 70 to 80 different types of irregular verb patterns and you will find pages and pages of verbs listed at the end that match one of these patterns.