ought + infinitive (ought to + infinitive)

Use ought + to + base verb. Dropping to (You ought study) is nonstandard in writing and usually looks like an error. Below are the rule, quick checks, many real wrong/right pairs for work, school, and casual contexts, plus copyable rewrites and memory tricks.

Quick answer

Always write ought to + base verb. If a verb immediately follows ought, insert to.

Correct: You ought to study for the exam.
Incorrect: You ought study for the exam.
If the tone feels off, swap ought to → should or rephrase for naturalness.

Core rule: why 'ought' needs 'to'

Ought is a semi-modal that takes the infinitive marker to. The usual structure is: subject + ought to + base verb. Unlike can or may, ought generally requires to before the verb.

Pattern: She ought to call. (correct)
Common error: She ought call. → She ought to call.

Grammar and real usage

Use ought to for duty, expectation, or formal advice; should is more conversational and softer. Negatives normally use ought not to (formal) or shouldn't (casual); oughtn't to exists but is rarely used in modern writing.

Negative formal: You ought not to ignore the warning.
Negative casual: You shouldn't ignore the warning.
Tone: We ought to complete the audit by Friday (formal). You should call her back (casual).

Examples: work, school, and casual wrong → right pairs

Each wrong line is a common omission; each right line is the standard correction. After some pairs there is a natural rewrite you can use in speech or informal writing.

Work - Wrong: We ought call the client now and confirm the dates. Work -
Right: We ought to call the client now and confirm the dates. Work - Natural: We should call the client now to confirm the dates.
Work - Wrong: You ought send the report by Friday to the finance team. Work -
Right: You ought to send the report by Friday to the finance team.
Work - Wrong: They ought review the proposal before the meeting. Work -
Right: They ought to review the proposal before the meeting.
School - Wrong: Students ought submit their essays by noon on Monday. School -
Right: Students ought to submit their essays by noon on Monday.
School - Wrong: You ought finish your lab before you leave the lab room. School -
Right: You ought to finish your lab before you leave the lab room.
School - Wrong: She ought revise chapters 3-5 if she wants to improve her grade. School -
Right: She ought to revise chapters 3-5 if she wants to improve her grade.
Casual - Wrong: I ought get a new phone before the trip. Casual -
Right: I ought to get a new phone before the trip.
Casual - Wrong: He ought apologize for what he said last night. Casual -
Right: He ought to apologize for what he said last night.
Casual - Wrong: You ought try the tacos downtown - they're great. Casual -
Right: You ought to try the tacos downtown - they're great.

Try your own sentence

Test the whole sentence, not just the phrase. Context makes the right choice clear: if a verb immediately follows ought, insert to; if tone is off, try should.

Rewrite help and memory tricks

Quick 3-step fix: 1) Check if a verb follows ought. 2) If yes, insert to. 3) If tone feels unnatural, replace with should or rephrase.

Checklist: Add to → Read aloud → Consider should or a plain verb for tone.
Rewrite examples (copyable): Wrong: You ought study more. Fix: You ought to study more. Natural: You should study more.
Rewrite examples: Wrong: I ought say thanks to her. Fix: I ought to say thanks to her. Natural: I should thank her.
Rewrite examples: Wrong: We ought start the project next week. Fix: We ought to start the project next week. Natural (email): Let's start the project next week.

Mnemonics and quick diagnostics:

Mnemonic: "Ought needs To" - say "ought-to" in your head before writing the verb.
Substitution test: Replace ought to with should. If the sentence works with should, you likely need to add to after ought.

Spacing, hyphenation, and similar mistakes

Write ought to as two words. Do not hyphenate or merge them. Use spoken forms only in dialogue or phonetic transcription.

Correct: ought to (two words).
Incorrect: ought-to (hyphen), oughtto (single word).
Spoken: oughta (phonetic) - fine in dialogue, avoid in formal writing.

Other common omissions: learners also drop to after supposed and in some constructions with help. Treat each verb/phrase separately and check whether the infinitive marker is required.

Wrong: I'm supposed leave at six. →
Right: I'm supposed to leave at six.
Help note: help can appear with or without to in some dialects (help do / help to do), but ought almost always keeps to.
Wrong: She ought apologize. →
Right: She ought to apologize.

FAQ

Can you say 'ought' without 'to' in British English?

Standard British English normally uses to after ought. Spoken reductions (oughta) may blur it, but leaving out to in writing is nonstandard.

Is 'ought to' the same as 'should'?

They overlap: both give advice or signal expectation. Ought to is slightly more formal or duty-focused; should is more common in everyday speech.

How do I fix a sentence quickly when I spot 'ought'?

If a verb follows ought directly, insert to: ought + to + base verb. If the tone needs to be softer, replace ought to with should or rephrase the sentence.

Is 'oughtn't to' correct for negatives?

Oughtn't to exists but is rare. Most writers use ought not to in formal contexts and shouldn't in casual contexts.

When is it okay to write 'oughta'?

Oughta (oughta) is a phonetic spelling of casual speech. Use it only in dialogue, transcription, or informal contexts-not in formal writing.

Try your sentence now

Paste a sentence that uses ought into your draft. If a verb immediately follows ought, insert to and read it aloud. If you prefer a conversational tone, try should instead and compare how it sounds.