ed is id when it comes after t and d like wicked, wasted, studded, actually it's not alwasy id in some dialects it can be ad or ed, it becomes t after consonants like s, words like missed, kissed, pressed, in all of those ed is t, I think it's amtter of saying ti the easiest way like there's no way you can just say wasted without the ed that sounds like id because in that case you'd get waste which would be the present tense, but saying kiss ed is pointless cuz kist is different enough from kiss to signal you that it is past tense