Consider the Heiban verb やる. According to [a video on Japanese verb pitch
accent rules](https://youtu.be/clOfEb5Jjp0?t=466), Heiban verbs with no
downsteps remain Heiban when conjugated to their negative form.
[Prosody](https://www.gavo.t.u-tokyo.ac.jp/ojad/eng/phrasing/index) confirms
this rule with やらない:

> [![enter image description
> here](https://i.stack.imgur.com/gWq4q.png)](https://i.stack.imgur.com/gWq4q.png)

But if I add a か particle after it, it completely changes the pitch pattern
detected:

> [![enter image description
> here](https://i.stack.imgur.com/CQtTZ.png)](https://i.stack.imgur.com/CQtTZ.png)

Is this a mistake with Prosody, or can clause ending particles like か (and
others like ね, な, の, etc) affect the pitch of the verbs before them?
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2022-09-12T20:34:10.690
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2023-03-18T06:15:13.800
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question
verbs pitch-accent
Can the か particle change the pitch accent of verbs?