Which languages you think are difficult depends on the person.
Which languages you consider to be difficult differs from person to person.
How difficult you think a language is different for different people.
「何の言語が難しいと感じるかは人によって違う」は英語に訳すとこのようです。
Which languages you think are difficult depends on the person.
Which languages you consider to be difficult differs from person to person.
How difficult you think a language is different for different people.
それそれの言い方があります。
「〇〇は人によって違う」はこのようです。
〇〇 depends on the person.
〇〇 differs from person to person.
〇〇 is different for different people.
What languages you think are difficult depends on your native language. も言えるかもしれません。(何言語は難しいは母国語によって違う)
ご参考までに。