First Group
Cost
Put
Cost-cost-cost
Put-put-put
Ring
Sing
Ring-rang-rung
Sing-sang-sung
Leave-left-left
Drive
Drive-drove-driven
Bring
Bring-brought-brought
Set
Let
Set-set-set
Let-let-let
Sink
Sink-sank-sunk
Meet
Meet-met-met
to be
to make
be-was/were-been
make-made-made
Fight
Buy
Fight-fought-fought
Buy-bought-bought