How do you say “I don’t know” in your native language or the language you are learning?

pimsri:

depends on what exactly you don’t know about, but in general it’s “Mai ru krub/ka”, Krub if you identify as male, or Ka if female. 

我不知道 wo bu zhi dao (Mandarin) ngo bat zi dou (Cantonese)

Ich weiß nicht (German)