PRESENT SIMPLE = I WORK ON MONDAYS , I DON'T LUNCH AT 2 P.M.
PRESENT CONTINIOUS = I AM WORKING THIS SATURDAY
PRESENT PERFECT = HE HAS NEVER BEEN IN SPAIN
PRESENT PERFECT CONTINIOUS = I'VE BEEN STUDYING ENGLISH FOR 2 YEARS.
PAST SIMPLE = I WORKED ALL NIGHT, THEY DID NOT COME
PAST CONTINIOUS = WE WERE LISTENING TO MUSIC
PAST PERFECT = THEY HADN'T DEPARTED YET. I HAD TAKEN MY LUNCH BREAK.
PAST PERFECT CONTINIOUS = THEY HAD BEEN WAITING SINCE 3 P.M.