[schoen]

Were you thinking that maybe foreign languages were substitution ciphers, and that you were eventually going to be taught the substitutions you needed?

I think I had a similar thought when I was about six or seven and came across the Cyrillic alphabet printed in the back of a dictionary. I thought "oh wow, I guess if you learn this, then you know Russian!" -- thinking of Russian as something like English transliterated into Cyrillic.

There are phenomena in language that do work a little bit this way (https://en.wikipedia.org/wiki/Relexification, https://en.wikipedia.org/wiki/Avoidance_speech) but usually at the word level and not in contexts that will really help second language learners.