To be, was/were been
To have had had
To mean meat meant
To learn learnt learnt
To become became become
To bring brought brought
To know knew known
To think though though
To buy bought bought
To pay paid paid
To take took taken
To do did done
To begin began begun
To give gave given
To make made made
To keep kept kept
To get got got
To read read read
To show, showed showed (shown )