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Look, I know that Duolingo is loved by thousands - if not millions - of people who want to learn a new language. 

You just download the app, select your target language, and wham! before you know it you're earning badges and well along the way to learning your desired language.  

Well, I'm sorry to inform you but, Duolingo won't make you fluent. Here's just a few reasons why:

• There's a limited amount of vocabulary
• There's a lack of real-world audio content

Limited Vocabulary

Having a large vocabulary base - an active and passive vocabulary base - is crucial when it comes to progressing in your language learning. 

Although there isn't a general consensus among linguists, translators, and language learning enthusiasts about how many words you'd need to have in order to reach "fluency" many do agree that you'll need a few thousand words to be able to begin conversing. This word range falls somewhere between 1,000 - 3,000 words.

Using Duolingo will expose you to a lot of words as you begin picking up badges, but you'll eventually reach a limit on this exposure and will need to find other ways of increasing your vocabulary base.  

No Real-World Audio Content

Having good listening comprehension is just as important as the ability to read and understand text, but this listening comprehension goes beyond just identifying basic words, simple phrases, and rudimentary sentences.

Listening to native speakers in your target language discuss real-world situations is super important for reaching your language learning goals.

This is where Duolingo missed the boat big time. You see, when natives are speaking, they don't speak like books. Nothing is academic at all in these conversations.

So although you may be able to understand the basic words and phrases that you hear in Duolingo's text-to-audio feature, when it comes time to interacting with the native speakers of your target language you'll be at a disadvantage due to your lack of real-world listening comprehension.

All in all, Duolingo is a kin to riding a bike with training wheels. It can help you in the beginning, but you'll need to take those training wheels off and fall down a couple of times before you can reach your language learning destination.