There are many so-called irregular verbs in French. Fortunately the vast majority follow the same logic for endings: S, S, T, ONS, EZ, ENT.

As usual the S and the T are not pronounced. The ONS and EZ are pronounced. The letter before ENT is also pronounced (but not ENT itself).
for example
Partir (to leave):
Je pars, tu pars, il/elle/on part, nous partons, vous partez, ils/elles partent.
Lire (to read):
Je lis, tu lis, il/elle/on lit, nous lisons, vous lisez, ils/elles lisent.
Voir (to see):
Je vois, tu vois, il/elle/on voit, nous voyons, vous voyez, ils/elles voient.
- Sometimes the T will be replaced with a D
Prendre (to take)
Je prends, tu prends, il/elle/on prend, nous prenons, vous prenez, ils/elles prennent.
Perdre (to lose)
Je perds, tu perds, il/elle/on perd, nous perdons, vous perdez, ils/elles perdent.
- Sometimes the S will be replaced with an X
Pouvoir (can)
Je peux, tu peux, il/elle/on peut, nous pouvons, vous pouvez, ils/elles peuvent.
- Here is a pdf of the irregular verbs.
verbes-irrecc81guliers-franccca7ais-precc81sent
Print it out, stick it on a wall, read it out loud a few times without thinking too much about it.
Exercices
french-irregular-verbs-exercises
french-irregular-verbs-corrections-copie
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