imperfect

To be held or bound in duty or moral obligation. These ought ye to have done, and not to leave the other undone. Matthew 23:23. We that are strong ought to bear the infirmities of the weak. Romans 15:1. Thou oughtest therefore to have put my money to the exchangers. Matthew 25:27.

To be necessary; to behoove. Ought not Christ to have suffered these things and to enter into glory? Luke 24:26.

To be fit or expedient in a moral view. My brethren, these things ought not so to be. James 3:10.

As a participle, owed; been indebted to. The love and duty I long have ought you. That followed, sir, which to myself I ought.

In Chaucer’s time, it was used impersonally. “Wel ought us werke,” that is, well it behooveth us to work.