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Should/ought to

Meaning

Forms of the MV

Forms of the infinitive

Kinds of sentences

Some other ways of expressing the same meaning

Sentence patterns

1. Obligation weakened to the sense of advice, desirability

should

shouldn’t

Should I…?

ought to

oughtn’t to

Ought I to…?

Indefinite Infinitive

Continuous Infinitive

The Perfect Infinitive indicates that a desirable action was not carried out (an undesirable action was not carried out).

affirmative

interrogative

negative

I advise you to…

I advise you not to…

I recommend you to do…

I urge you to do…

It is for you to do…

I would advise you to do…

You ought to/should help your friend. He is in trouble.

You should/ought to be getting ready for your report.

You ought to/should have changed for the Underground. Gorky Street is far away from here.

He oughtn’t to/shouldn’t have left London without visiting Hyde Park.

2. Instructions, corrections

should

shouldn’t

Should I…?

Indefinite Infinitive

affirmative

interrogative

negative

This preposition should be pronounced with a neutral sound in an unstressed position.

You should take this medicine three times a day before your meals.

3. Disapproval, reproach for failing to do what was one’s duty or moral obligation

should

shouldn’t

ought to

oughtn’t to

The Continuous Infinitive refers the action to the present.

The Perfect Infinitive indicates that the action was not carried out.

affirmative

negative

You ought to/should be speaking more clearly.

You oughtn’t to/should have allowed him to go out so early after his illness.

4. Supposition implying probability

should

shouldn’t

ought to

oughtn’t to

The Indefinite Infinitive refers the action to the present or future.

The Perfect Infinitive refers the action to the past.

affirmative

negative

Very likely he… It’s likely he… Most likely he… Very probably he… I think it is probable that…I expect he… Probably not…

This dish ought to/should be very delicious as it has been prepared by Mother.

This dish is very delicious. It ought to/should have been prepared by Mother.

5. Emotional colouring

Should I…?

Indefinite Infinitive

interrogative

Why should I?

Why should you help him?

How should you know?