"知ってるんだろう"
I've seen this conjugation (知ってるんだろう) for the verb 知る, but I could not find anywhere what this form is supposed to express.
Is it a current conjugation in mainland Japan? I've seen it in a song from 沖縄, so maybe it's some kind of regional dialect. Whats does it express anyway?more specifically, i could not find 知ってるんだろう in this conjugation chart
http://www.csse.monash.edu.au/~jwb/cgi-bin/wwwjdic.cgi?1W%C3%CE%A4%EB_v5r

is 知ってるんだろう correct? or 知っているんだろう, with 【い】?

Question

"知ってるんだろう"
I've seen this conjugation (知ってるんだろう) for the verb 知る, but I could not find anywhere what this form is supposed to express.
Is it a current conjugation in mainland Japan? I've seen it in a song from 沖縄, so maybe it's some kind of regional dialect. Whats does it express anyway?more specifically, i could not find 知ってるんだろう in this conjugation chart
http://www.csse.monash.edu.au/~jwb/cgi-bin/wwwjdic.cgi?1W%C3%CE%A4%EB_v5r

is 知ってるんだろう correct? or 知っているんだろう, with 【い】?

Answer

We use it in general everywhere in Japan.

It's 知る+ guess, for example: 
I wonder why you know (something) = わたしはあなたがどうして(something)を知っているのだろうとふしぎです。
I think that probably you might have known (something) = わたしはあなたが(something)を知っているだろうとおもいます。

Since my English isn't very well, I hope other people help you and I also hope this was helpful.

Answer

知っているんだろう　mean suspect other's knowing the fact  the person should be hide the fact in sure if not sure "知っていますか”　　知る(te form しって(know) +いる（exit)+ da(show demind )+ rou (show suspicion)　(te form make network the word)  知っているのだろうand 知ってるんだろう　long from and short from make sound short like english ” Isn't”　Japanese also have full form and short form long form little formal than short form.

Answers · 2

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