New "unknown" words
While doing the "strengthen skills" lessons, I'm suddenly presented with words I have not been taught (yet?). Sometimes it's just single words, but I have encountered several words in a sentence as well, about which I didn't know a thing.
Is that normal? I'm quite sure I didn't know a lot of the words in question, because I've gone throught the skills rather slowly, so I feel quite overwhelmed when I'm suddenly presented with these new words.
The problem is not that new words are introduced, but rather how they are introduced in this specific example. It interrupts my workflow. I've learned new words by starting new skills/lessons, obviously, but when I "strengthen" my skills, I expect to do so with elements of the things I've already learned. When I do it now though, new words are thrown in, and it's confusing me.
It's like preparing for a history test, and in the test you're suddenly supposed to calculate the apparent diameter of the sun as seen from Mars. Of course it's still possible to do, but it's very hard to concentrate on a given subject (i.e. the things I've previously learned, which I now wish to practice).
My guess is that the tree may have also been updated/upgraded. I don't mind it - This is like the real world. Even conversant in a second language, we are going to get words thrown at us when speaking to a native speaker that we may not know yet.
My guess is that it’s normal, if only because some words can be found in only a small number of exercises, and it’s the luck of the random number generator if someone receives a particular exercise or not. When I do the Strengthen Skills, I often receive certain exercises over and over again, despite entering a correct answer for that exercise every time, so I’d imagine that the counterpart of that is that other exercises are rarely (if ever) offered.
I doubt if the Duolingo infrastructure software keeps track of which exercises a particular user has seen and only offers those previously encountered exercises through Strengthen Skills.