What is the difference between the two following sentences?

> Fred san wa Nihongo o hanaseru

> Fred san wa Nihongo de hanaseru

Right now, I think the first using wo, is probably saying Fred can speak
Japanese while the second one is saying he can speak using Japanese. Is this
correct? Which is most natural?
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question
particle-を particle-で
を vs で - Which is more natural
I'm not a native speaker, but I think both are grammatical and natural
depending on the context.

* * *

> **(A)** フレッドさんは日本語 **を** 話せる
>

>> Fred can speak Japanese

Because the object of 話せる is a language, it means 'to be able to speak that
language.'

> **(B)** フレッドさんは日本語 **で** 話せる
>

>> Fred can speak **in** Japanese

By using で, it means 'to be able to speak using that language.' で marks the
means, that is, the way something is done.

Note that 言う can be used as well, but the meaning is different.

> フレッドさんは日本語 **で** 言える
>

>> Fred can say it **in** Japanese.

**A** may be uttered as a response to 'Can Fred speak Japanese?' On the other
hand, **B** may be uttered as a response to 'Can Fred speak in Japanese? I'm
having a hard time understanding what he's saying **in** English.'

Another example with で:

> まだ英語でうまく話せません
>

>> I'm not good at speaking English yet.

>
>
> [Jisho.org](https://jisho.org/search/%E3%81%A7%E8%A9%B1%E3%81%9B%E3%82%8B%20%23sentences)

A literal translation for the above would be 'I can't _skillfully_ speak
English yet.'
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