Past Simple started,was,understood,didn't work,couldn't,died,had to,were,didn't forget,wanted,walked,remembered,didn't want,left,went,worried.
Past Perfect had made, hadn't bought,had been, had wanted ,had been,had prepared,had planned ,had chosen,had bought,had thought,had gone, had begun.
past perfect
past progressive
например: past simple - save,got,died,killed...