I think it's time you made your mind up regarding this situation because nobody really knows whose part you are on. (*) mind (*) regarding (*) whose (*) part
This is a companion discussion topic for the original entry at https://english.best/questions/24247,i-think-its-time-you-made-your-umindu-up-uregardingu-this-situation-because-nobody-really-knows-uwhoseu-upartu-you-are-on/