My "pause, play, and fast forward" keys are now useless

Hi there, jeffreyfromchongqing!
Thanks for reaching out to the Apple Support Communities! Based on what you are what you are describing, it sounds like you have keys not working on your keyboard and I am happy to help out! Take a look at this article with the best steps to follow If your Apple keyboard doesn't work. This article will guide you through the best steps to try along with the next steps to take if the issues continue with those keys. If this is not the path you are going, please feel free to circle back with more information about the issue.
Cheers!