Algorithm when teaching a new or weak word
This applies especially to nouns and vocab (eg. "coat" or "dress"). It is getting a bit frustrating to be "taught" new words by asking me to directly translate a sentence with a new or weak word before I even know what the word is. The quiz question where you select the correct picture is ideal for unexposed or weak words. Only when your "weakness" goes beyond a certain point would you be asked more difficult quiz questions.
I agree with you. I'm especially frustrated in situations where I have to listen to audio and type a sentence that includes a word that I have never seen written yet. It would be more fruitful to introduce the written word with a hover over at least once before the audio question or the translate from English question.