say-says-saying-said,open-opens-opening-opened,have-has-having-had,swim-swims-swimming-swam,study-studies-studying-studied,try-tries-trying-tried,do-does-doing-done,wrap-wraps-wrapping-wrapped,watch-watches-watching-watched,pass-passes-passing-past,reach-reaches-reaching-reached,begin-begins-beginning-begun,be-is-being-been,fly-flies-flying-flown,stop-stops-stopping-stopped,forget-forgets-forgetting-forgot,book-books-booking-booked,wish-wishes-wishing-wished,wash-washes-washing-washed,fix-fixes-fixing-fixed.