DAI RISPOSTE - 日本語

How do you say the academic educational linguistic correct discussion context for the formal grammar class case form "I do not know" or the informal grammar class case form "I don’t know" or the slang grammar class case form "Don't know" within the American English language skills and culture exchange, and the Japanese language skills and culture exchange submission should be as an example that is displayed?
 

The title of this academic educational linguistic correct discussion context upon the American English language skills and culture exchange and the Japanese language skills and culture exchange grammatical correct context should be within the formal grammar class case form "I do not know" or the informal grammar class case form "I don’t know" or the slang grammar class case form "Don't know" within the American English language skills and culture exchange, and the Japanese language skills and culture exchange submission should be? = Wakaranai. =  わからない. = 分らない.
 

知りません(shrimasen) or わからない(wakaranai)