Prefixes and adjectives ...they often cause problems, so it is important to practice creating negative adjectives often and effectively. I decided to create a tool to make it easier to remember the adjectives created after adding an appropriate prefix.
We have 6 prefixes, to which we will attach the adjective that appears at the top of the screen. We drag the adjective to the correct prefix in our opinion. After you have sorted out all the adjectives, you can practice creating sentences in order to memorize better new words. We have two versions of the exercise - easier and more difficult. In the simpler version, if we make a mistake, we continue with the matching; in the second version, after making a mistake, we return to the initial state. Each session is accompanied by a clock, so we can control the time and challenge the students.

https://linguarnia.com/prefixit/

Good luck!