It wouldn't be that hard to tell what you're saying through a combo of tone of voice and the fact that Spanish and French are fairly similar languages. And, in my experience, language teachers tend to have knowledge of a few languages.

hm. i can ask her if she knows french. i have a 4 day weekend, so, yea

And then... what? go up to her, reel of some angry sounding French, and get in trouble for being rude to her?

Just, maybe don't "cuss out" your teacher.

shhhhhhh no one has to know... i have like one french teacher in the school

Thank you for the feedback What if your science teacher calls you dumb for not being able to make a series and parallel circuit on the same device and you’re in 5th grade?

Oh ok thank you