Match each base form to its past simple form.

Explication

The past-simple pattern mix here is 2 verbs using one shared past-and-participle pattern, 1 verb using separate changes for past and participle, and 3 verbs using an unchanged three-form pattern. The past-simple match follows the verb's own irregular class, so visual resemblance to another verb's form is not enough; the dominant class is an unchanged three-form pattern (3 of 6), with 3 pattern classes represented.