早いな, 早いだ

[Dr. Fumbles]

Da after i-adjectives: hayai da; い-形容詞は後に「だ」を使っている：（早いだ）」 [mod: original thread title]


Hello again, fellow Japanese learners and speakers. I have yet another difficult question.
So, like my other questions, I understand the basics of Japanese grammar. However, this question has bothered me for quite some time.

My question was sparked by this video: "Japanese Idol Girls Ruined by Marmite & Liqourice" by Abroad in Japan.
xxx (mod: no multimedia link may be inserted without prior approval by mod)

At 3:23, Ryotaro says 「早いだ」。He then says 「早いだ」 again at 3:34. It's much clearer the second time.
Every source I've ever used to learn Japanese says you cannot use だ after i-adjectives.

So, am I not hearing him correctly? I'm sure it's「だ」；but could he be saying「早いな」instead? Or is this an extremely non-standard form of Japanese where it's not as formal「早いです」and not as casual/plain as「早い」? Is it in-between both of these, or did Ryotaro just misspeak?

Thanks for any help.

 

[frequency]

Every source I've ever used to learn Japanese says you cannot use だ after i-adjectives.

Yes, you're right. 早いだ is wrong.

but could he be saying「早いな」instead?

Yes, it should be 早いな. Has he said 早いだ? It doesn't sound clear so I'm not sure. Sorry.
The な is 終動詞 助詞 3: 感動を表す.

In some local dialects 早いだ might be possible, but not very standard. Yes.

 

[Dr. Fumbles]

Yes, you're right. 早いだ is wrong.
In some local dialects 早いだ might be possible, but not very standard. Yes.

I listened to the video again. After paying even more attention, I'm pretty sure Ryotaro is saying 早いな。
On the English Wiktionary for な it says:
"Usage notes
It is often used when you speak to yourself, and can be considered less formal than the agreement-asking particle ね."
So he was probably talking to himself and thinking out loud. That is, if the English Wiktionary is accurate.

Also, I was wondering about 早いだ showing up in some dialects or varieties of Japanese. But, you answered that for me.

Thanks again.

 

[frequency]

You're welcome.

So he was probably talking to himself and thinking out loud.

Primarily, 感動を表す終動詞助詞な can be used to work so. At the same time, a speaker can express that he or she has got impressed by something or an event, when it is heard. In your example, a hearer can understand that Ryotaro is impressed by her? quick reaction.