Past Tense Chums

I don’t understand the past tense. Why is it that fight is fought? And catch is caught when liked for like is right. And what about sighted is that a past tense of sight? The list is endless, and I spent hours amazed by all of it. It was worse than a stinky sweaty work-out so I sweated! Notice the t is pronounced so it’s Ted not “Ed” at the end of it. But Ted and Ed sometimes have a rest when “En,” “O” and “A” led. Yes, they led well, so that steal is not stealed but stolen or stole, Then the A appeared when run is ran not runned. The O was the big boy with write when he trumped wrote over writed. I’m tired of this mess, so I’ll just let my ESL teacher do the word roll.