Two of the hardest things about languages are grammatical rules and formations, and illogical idioms. Since Esperanto has very, very few of the former (none irregular), and none of the latter, that does make it extremely easy to learn. On top of that, the sound system of Esperanto was chosen to be easy for speakers of most languages to pronounce (although why it includes hx (h-circumflex, like German ch or Spanish j) I don't really understand; that's an alien sound for many languages).
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