ought to

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ought to
1. expectation

You use should or ought to to say that you expect something to happen.

We should be there by dinner time.
It ought to get easier with practice.

You use should or ought to with have and an -ed participle to say that you expect something to have happened already.

You should have heard by now that I'm O.K.
It's ten o'clock, so they ought to have reached the station.

You also use should or ought to with have and an -ed participle to say that something was expected to happen, but did not happen.

Bags which should have gone to Rome were sent to New York.
The project ought to have finished by now.

Be Careful!
You must use have and an -ed participle in sentences like these. Don't say, for example, 'The project ought to finish by now'.

2. moral rightness

You use should or ought to to say that something is morally right.

Crimes should be punished.
I ought to call the police.
3. giving advice

You can say you should or you ought to when you are giving someone advice.

I think you should go see your doctor.
I think you ought to try a different approach.
4. negative forms

Should and ought to have the negative forms should not and ought not to.

This should not be allowed to continue.
They ought not to have said anything.

The not is not usually pronounced in full. When you write down what someone says, you write shouldn't or oughtn't to.

You shouldn't dress like that, Andrew.
They oughtn't to mention it.

When you make a negative statement with ought in American English, you can omit to:

You oughtn't answer the door without your shirt on.
References in classic literature ?
This inquiry will naturally divide itself into three branches -- the objects to be provided for by the federal government, the quantity of power necessary to the accomplishment of those objects, the persons upon whom that power ought to operate.
Nearly the same inquiry may be made concerning a woman and a child, whether these also have their proper virtues; whether a woman ought to be temperate, brave, and just, and whether a child is temperate or no; and indeed this inquiry ought to be general, whether the virtues of those who, by nature, either govern or are governed, are the same or different; for if it is necessary that both of them should partake of the fair and good, why is it also necessary that, without exception, the one should govern, the other always be governed?
It is evident then that a slave ought to be trained to those virtues which are proper for his situation by his master; and not by him who has the power of a master, to teach him any particular art.
The perigee distance, therefore, is that which ought to serve as the basis of all calculations.
-- The preceding remarks being admitted, the cannon ought to be pointed to the zenith of the place.
Suppose, then, that the expressions defining the authority of the convention were irreconcilably at variance with each other; that a NATIONAL and ADEQUATE GOVERNMENT could not possibly, in the judgment of the convention, be affected by ALTERATIONS and PROVISIONS in the ARTICLES OF CONFEDERATION; which part of the definition ought to have been embraced, and which rejected?
They must have reflected, that in all great changes of established governments, forms ought to give way to substance; that a rigid adherence in such cases to the former, would render nominal and nugatory the transcendent and precious right of the people to "abolish or alter their governments as to them shall seem most likely to effect their safety and happiness,"[2] since it is impossible for the people spontaneously and universally to move in concert towards their object; and it is therefore essential that such changes be instituted by some INFORMAL AND UNAUTHORIZED PROPOSITIONS, made by some patriotic and respectable citizen or number of citizens.
A prince ought to have no other aim or thought, nor select anything else for his study, than war and its rules and discipline; for this is the sole art that belongs to him who rules, and it is of such force that it not only upholds those who are born princes, but it often enables men to rise from a private station to that rank.
A wise prince ought to observe some such rules, and never in peaceful times stand idle, but increase his resources with industry in such a way that they may be available to him in adversity, so that if fortune chances it may find him prepared to resist her blows.
SOCRATES: Dear Crito, your zeal is invaluable, if a right one; but if wrong, the greater the zeal the greater the danger; and therefore we ought to consider whether I shall or shall not do as you say.
JUDGES ought to remember, that their office is jus dicere, and not jus dare; to interpret law, and not to make law, or give law.