Why is so difficult for us to learn a foreign language?

inglesYesterday a friend of mine added this funny image in Facebook and it made me to think about our English level and why is so difficult for us to learn a foreign language.

I studied English at school when I was a child. Some years later, when I finished university I decided to study English again at Escola Oficial d’Idiomes de Drassanes in Barcelona. And now I have fifth level degree, which is like having the First Certificate.

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