Because writing is one of the most effective skills in becoming fluent in a language, it is worth investing resources to make it more powerful. I strongly suggest implementing a translation practice tool alongside the writing exchange that operates similarly to the flashcards. Each “card” will provide a sentence in the user’s known language to be translated into the language being learned (or vice versa). An AI will draw from the user’s bank of words being learned or already known to determine the words of the sentence to be translated. There will also be a difficulty setting that determines the sentence complexity, length (perhaps a whole paragraph if on hard mode), and words chosen (more elusive words on hard mode). An AI will then be prompted to make corrections and suggestions with explanations. I know from personal experience and study that implementing such a tool will skyrocket progress toward comfortable speech in language learning.