Grammar

09/13/2026

Ought is a modal verb used to express duty, advisability, or a strong probability.

Unlike regular verbs, modal verbs follow their own unique set of rules:

No tense changes: There is no “oughted” for the past tense or “oughting” for the future.

No subject changes: It stays exactly the same whether you say I ought, he ought, or they ought (never “oughts”).

No helper verbs: You don’t use “do” or “does” to make a question. For example, you say “Ought we go?” rather than “Do we ought to go?”

“Ought” is so stripped of its original verb properties that it sometimes requires “to” just to function (e.g., “I ought to go”).

Because it never alters its shape, linguists call it a defective verb. Seems like an unnecessary pejorative to me.

Ought is also a Preterite-Present verb: This means an old past-tense form changed its meaning over time to also represent the present tense.

That is, ought is a defective modal Preterite-Present verb.

In fact it’s the only one.