How about new features to improve the duolingo resource?

There are too many lingtones without using. Could developers make advanced set of grammar rules and exercises, that would be available by purchasing it with price in 500 lingtones or else? It will intrigue some persons to improve their skills by reaching the goal of opening new lessons.

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Вивчайте англійську мову, приділяючи цьому лише 5 хвилин на день. Безкоштовно.