Like many such projects, you seem to be working from the principle that language is learned at the word level. It is at the very start with the earliest, most b

Like many such projects, you seem to be working from the principle that language is learned at the word level. It is at the very start with the earliest, most basic vocabulary. But after the first 100-200 or so most-common words (number depends on the language), language is best and most often learned in chunks, phrases, collocations, dialogues, etc. The key mistake in most language-learning apps is that they put off this latter stage and focus on words, and then pretty much never get back to the latter stage in a meaningful way except through stilted conversations that are little better than those you can hear on hundred-year-old vinyl records. Source: I am a linguist and language specialist.