日語 Japanese Ask Questions Thread2 質問

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

>>443
you don't use だ with i-adjectives, right?

Correct, but you can circumvent the rule by putting a の (or ん) before the だ:

君の友人はすごく面白いんだね。
ここは寒いのだ。
うれしいのだ！

面白いだろう

だろう after an i-adjective is perfectly acceptable.