What's your student demographic look like? In my son's class, there are 2 gringos. the rest are all Hispanic and from what he says are all native Spanish speakers. We're in AZ, so Spanish is prevalent here. Even I know enough to minimally get my point across most of the time conversationally, even if my pronunciation is terrible. He does better.
I did take it in middle school and high school but that was well over 10 years ago also I’ve forgotten most. Even then I wasn’t very good at it 
I did find a Spanish textbook at the dump for free so that was a score hah
