I don't think it's a question of sound. (I'm french) 'they're', 'their' and 'there' sound the same (spoken or in my head), but their meaning has nothing in comm

I don't think it's a question of sound. (I'm french) 'they're', 'their' and 'there' sound the same (spoken or in my head), but their meaning has nothing in common so I never mistake one for another. How you acquire a language plays here. I learned english fully conscious of what I was doing rather than my organic absorption of french.