日語 Japanese Ask Questions Thread2 質問

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Japanese - Ask questions thread
http://dis.4chan.org/read/lang/1174719097/l50

you don't use だ with i-adjectives, right? So, what about times when you want to say だろう? You could say でしょう but if you're speaking with friends, isn't it polite which is out of place?

I know with kansaiben you can use や with i-adjectives but だ is kind of tricky

So if I wanted to say, 面白いだろう, would that be the best way, or do I need to say something else to sound more natural?