VERBS, MOODS OF:-- SUBJUNCTIVE: auxiliary formsSubjunctive auxiliary forms. The simple form of the subjunctive is sometimes interchanged and co-ordinate with the auxiliary form.
Note here that "livedst" and "shouldst" imply inevitability and compulsion. "Wouldest" is used in the passive because the passive in itself implies compulsion. "Would" is used after "dulness" and "greediness" because they are quasi-personified as voluntary persecutors. Why not "hazardedst" as well as "livedst?" Perhaps to avoid the double d. "Do," "did," are often used with verbs in the subjunctive:
“If thou wert the ass, thy dulness would torment thee, and
still thou livedst but as a breakfast to the wolf; if thou wert the
wolf, thy greediness would afflict thee, and oft thou shouldst hazard
thy life for a dinner; wert thou a horse, thou wouldest be seized by
the leopard; wert thou a leopard, thou wert german to the lion.
“Better far, I guess,
That we do make our entrance several ways.
“Lest your retirement do amaze your friends.