ESEN
Which one to use?Intermediateverbo modalverbo semi-modal
ShouldvsOught to
'Should' and 'ought to' express advice or moral obligation with virtually the same meaning; 'should' is more common.
Side-by-side comparison
Should
verbo modal"Should" and "ought to" are near synonyms for giving advice or expressing moral obligation. The difference in meaning between the two is minimal.
You should eat more vegetables, your body needs the vitamins and fibre every day.
She should call her parents more often, they worry when they do not hear from her.
Should I take a jacket? It looks like the weather might turn cold later this afternoon.
Ought to
verbo semi-modalThe main difference is structural: "should" stands alone as a modal, without "to". "Ought to" always takes "to". In everyday speech, "should" is far more common.
You ought to apologise to her, what you said was really hurtful and she is very upset.
People ought to recycle more, the impact on the environment is really significant.
The report ought to be ready by tomorrow, he has had enough time to finish it properly.
Common mistake
Three errors with "ought to":
- 1."You ought go" is wrong: "ought to" ALWAYS requires "to" ("You ought TO go").
- 2.In questions and negatives, modern English strongly prefers "should" because "ought you to call?" sounds old-fashioned.
- 3.And "You didn't ought to do that" is dialectal; standard negative is "You ought not to do that" or "You shouldn't do that."
Trick to remember it
- •Modern practical rule: "should" and "ought to" are interchangeable for advice and moral obligation in affirmative sentences.
- •When in doubt, use "should", it works in all contexts.
- •Reserve "ought to" for affirmative sentences when you want a slightly more formal tone.
Quick rule
- •"Should" and "ought to" = same meaning for advice and moral obligation.
- •"Should" works in all contexts (affirmative, negative, question).
- •"Ought to" always needs "to" and sounds more formal or old-fashioned in questions and negatives.
Did you know?
OUGHT TO is one of the most declining modal verbs in modern English. Linguistic corpora show its use has decreased approximately 50% in written English between 1950 and 2010. In American English, the decline is even more pronounced: many young speakers perceive it as formal or even "British." This process, in which a more complex grammatical element (semi-modal with "to") is replaced by a simpler one (bare modal: SHOULD), illustrates what linguists call "linguistic economy" or "morphological simplification": over time, languages tend to prefer simpler forms when two forms express the same meaning.
Practise what you learned
Exercise 1 · Pick the right one
You _____ see a doctor about that cough. It's been going on too long.
Exercise 2 · Pick the right one
There _____ to be more recycling bins in this neighbourhood.
Exercise 3 · Form the word
Related word pairs
CanvsMay
"Can" expresses ability or capacity (to be able to do something); "may" expresses formal permission or possibility (something might happen).
MustvsHave to
"Must" is internal obligation or logical deduction; "have to" is external obligation imposed by others.
ShallvsWill
'Shall' is a formal modal for first person or legal contexts; 'will' is the general future for all persons in modern English.
AvsAn
'A' is used before consonant sounds; 'an' is used before vowel sounds.
Bryan López
Founder of SpeakUP Academy