The vast majority of fiction is written in past tense, that's normal. Sometimes, though, I get too conscious of that fact as I'm writing. I feel like my suffix's are are big ugly warts all over the page. Too many words ending in -ed and it bothers me. He opened the door, paused, then he stepped inside. This is probably just me making mountains out of mole hills, but I do want to rein it in a bit.