Pitch accent difference: 本当だ！ and 本当だよ


I was under the impression that 本当 was 平板型: ほんとうだ{LHHHH}. And the exclamation
本当だ seems to follow this. But the addition of よ seems to change this, as I
feel like I hear ほんとうだよ{LHHHLL}. Is that correct? And if so does this apply to
other locutions?

Examples of 本当だよ: [1](https://youtu.be/y2CyxcpYndk?t=109),
[2](https://youtu.be/424nSAfA118?t=380)




They are saying ほんとうだよ{LHHHHL} in both examples, and it sounds natural.

Intonation is extremely important with sentence-ending particles like よ.
Different intonations convey completely different messages. When you gently
tell someone that something you have just discussed is true, you would keep it
high like ほんとうだよ{LHHHHH}.

ほんとうだよ{LHHHLL} sounds like a bit awkward variation of ほんとうだよ{LHHHHL}.

ほんとうだよ{HLLLLL} sounds completely off, by the way.




They are saying ほんとうだよ{LHHHHL} in both examples, and it sounds natural.

Intonation is extremely important with sentence-ending particles like よ.
Different intonations convey completely different messages. When you gently
tell someone that something you have just discussed is true, you would keep it
high like ほんとうだよ{LHHHHH}.

ほんとうだよ{LHHHLL} sounds like a bit awkward variation of ほんとうだよ{LHHHHL}.

ほんとうだよ{HLLLLL} sounds completely off, by the way.

