Words that don't change: let, cost, cut, put, hit, hurt, shut, Words which have the same form for Past Simple and Present Perfect: catch, say, buy, meet, pay, lose, get, have, Words that are different in all forms: do, forget, drink, drive, eat, go, be, take, Regular verbs (ending with -ed in Past Simple and Present Perfect forms): want, look, work, live, talk, start,

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