That approach has not been adopted in the conjugation of the verb in French ; the lexical root perdures throughout the whole conjugation with in some cases a change in a vowel or a consonant but not on the basis of an opposition between types of tenses ;
(for instance)
- faire : je fais (présent), je ferai (futur)
- peindre : je peins (présent), je peigne (subjonctif présent)
There is another particularity of the French verb, although it’s true for only a few verbs, and that’s the occurrence of missing forms, as in this case (paitre).
Aller is the obvious example, since it alternates between three stems, with a different one in the present and in the perfect (I also include examples in the compound past which replaced the perfect more or less completely):
Je vais ↔ j’allai
Je vais ↔ je suis allé
Être maintains the Latin stem change between sum and fuī:
Je suis ↔ je fus
Je suis ↔ j’ai été
And avoir‘s stem has attrited to nothing in the past participle and the perfect (it is preserved in writing as ⟨e⟩ but not pronounced), creating another alternation:
J’ai ↔ j’eus
J’ai ↔ j’ai eu
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