What does -n da mean?


#1

I heard the phrase “なるんだ” but I can’t find out what the conjugation or meaning is.

Is it a slang?


#2

It’s what is called “explanation mode” or “explanatory mode” (see Genki chapter 12 or Tae Kim link below)

http://www.guidetojapanese.org/particles3.html#part5


#3