buy-bought-bought
drive-drove-driven
see-saw-seen
hear-heard-heard
borrow-borrowed-borrowed
build-built-built
swim-swam-swum
finish-finished-finished
leave-left-left
be-was/were-been
go-went-gone
spend-spent-spent
put-put-put
turn-turned-turned
sit-sat-sat
take-took-taken
work-worked-worked
do-did-done