[KhoomeiK]

Some of what you're saying (knowing one language in general helps you learn to learn other languages) is true, but Japanese and Chinese are so grammatically different that the way structures in Esperanto map to Japanese just doesn't hold the same for Chinese. Mandarin is a highly analytical language (words don't inflect or conjugate depending on grammatical function or context: "He has one dog" "They has two dog") while Japanese is synthetic ("He has one dog "They have two dogs), meaning the latter is far closer to most European languages grammatically than either is to Chinese.

[munmaek]

That's not what they're talking about at all. They're talking about learning how to learn a language. Learning a second language gives you meta insight into language learning, which makes it far easier to move onto a third language.

For example, I studied German in college. I never really progressed in it that much, but learning how to learn made learning Korean significantly easier for me. It happens that esperanto can be useful for this as it doesn't have all the small idiosyncrasies and exceptions that real languages have.

[KhoomeiK]

>That's not what they're talking about at all. They're talking about learning how to learn a language.

Huh? I acknowledged that at the start of my comment:

>Some of what you're saying (knowing one language in general helps you learn to learn other languages) is true

[firethief]

Japanese actually is just like Mandarin in your example. Neither verbs nor typical nouns are inflected for number.

[KhoomeiK]

That's true. But there's an expansive politeness and tense inflection system as well as topic and object markers.