If you need a language that Duolingo doesn't offer, I recommend seeing if Pimsleur offers it first and, if not, Transparent Languages and finally Mango Languages. While 37 languages is a huge catalog for English speakers to learn, it's not comprehensive. If you know someone looking to learn English, Duolingo has ESL programs for speakers of many languages: Arabic, Bengali, Chinese, Czech, Dutch, French, German, Greek, Hindi, Hungarian, Indonesian (Bahasa), Italian, Japanese, Korean, Polish, Portuguese, Punjabi, Romanian, Russian, Spanish, Tagalog, Tamil, Telugu, Thai, Turkish, Ukrainian, and Vietnamese. The 37 real-world languages for English speakers are Arabic, Chinese, Czech, Danish, Dutch, Esperanto, Finnish, French, German, Greek, Haitian Creole, Hawaiian, Hebrew, Hindi, Hungarian, Indonesian, Irish, Italian, Japanese, Korean, Latin, Navajo, Norwegian, Polish, Portuguese (Brazilian), Romanian, Russian, Scottish Gaelic, Spanish, Swahili, Swedish, Turkish, Ukrainian, Vietnamese, Welsh, Yiddish, and Zulu. Best Hosted Endpoint Protection and Security Software.

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