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You can produce correct grammar without knowing any — correctly, at speed, with the right endings. It depends entirely on what unit you learn in.

The private worry is that everyone else is further along. They aren't — you're standing where the overwhelming majority stand, and it's the method that put you there.

Reconstruct the last conversation that failed. Did you know the words? Nearly always yes — which means vocabulary was never the constraint.

Close any app and the learning stops instantly. One medium walks out of the room with you and keeps going — and almost nobody designs for it deliberately.

Language is the least solitary thing humans do, and it's normally learned alone. Getting a word wrong in a duet is funny. Same error, entirely different meaning.

"You'll never learn it until you live there." Immersion is volume and stakes — nothing magical about the postcode. And you can manufacture the volume from your commute.

Two thousand words. Five thousand. Nobody who hit their number found it made the difference — because the word was never the unit of speech.

Duolingo built you a real asset — several thousand words of recognition. What it never asked you to do was produce a sentence at speed from nothing.

Somebody will speak to you without warning and you'll have about a second. You can't predict when — but you can predict, quite accurately, what gets said.

You can't schedule it, you can't revise for it, and you'll take it several times today. An involuntary signal beats a voluntary one because it can't be gamed.