While helping my children learn French spelling, I was horrified when I realized that there are 6 or 7 ways to write the sound [ɛ̃]:
un in (im) [i]en ain aim ein
Yeah, I've been there. Apparently my pronunciation of "Chretien" (Christian) was indecipherable, and the French people I was speaking with clarified it for me by saying, "you're saying cray-tee-uh(n), but it's pronounced cray-tee-uh(n)"
The first one is pronounced with an O shape with the mouth (like you would do with the word oh), and the others with more of a smile shape (like with the word see). It’s impossible to pronounce one like the other.
I’m not a native English speaker and I gave up trying to pronounce th (father, through). Although I can hear the difference.
Yup, very parisian. Love how then they almost mock how pain (bread) is pronounced in the south-west where you won't mistake the sounds between the words un pain.