oughtst

And if thou wert assured to prevaile upon this pursuite, yet thou oughtst to avoide it, if thou hast any regard of true friendship, and the duty therein justly required.

The Decameron 2004

But tell me now concerning Avarice, hast thou sinned therein, by desiring more then was reasonable, or withholding from others, such things as thou oughtst not to detaine?

The Decameron 2004

For thou, who dost burn all lands with thy flames, art {now} burnt with a new flame; and thou, who oughtst to be looking at everything, art gazing on Leucothoë, and on one maiden art fixing those eyes which thou oughtst {to be fixing} on the universe.

The Metamorphoses of Ovid Vol. I, Books I-VII 43 BC-18? Ovid 1847

Consider what it was thou wast born (unless thou art deceiving thyself as well), and pursue that which is allowable, and love that which, as a woman, thou oughtst {to love}.

The Metamorphoses of Ovid Literally Translated into English Prose, with Copious Notes and Explanations 43 BC-18? Ovid 1847

Thou art worthy of it, and assuredly thou oughtst to be courted spontaneously; and, if thou givest any hopes, believe me, thou shalt be courted [3] spontaneously.

The Metamorphoses of Ovid Literally Translated into English Prose, with Copious Notes and Explanations 43 BC-18? Ovid 1847

I am so, and thou oughtst the sooner to lie with me for that reason, — for look you, Child, there will be no Sin in’t, because

The Rover; or the Banish'd Cavaliers 1677