This simple chart shows the process of studying foreign languages. It explains which languages are too difficult to master, how much time it requires to finish the studies and how many native speakers are in the world.
It is common sense that many Romance languages are gauged as “easy,” based on their similarity to English, but I was surprised that Russian is only “medium.” Arabic, Chinese, Japanese, and Korean comprise the list of “hard” languages to learn for native English speakers.
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Source: voxy