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Shall / should, ought to

Modal verbs “should” and “ought to” are unchangeable. The difference in the meanings of these two verbs is sometimes very vague, therefore they are often interchangeable. Unlike the verb “should” which is used to express an individual opinion, the verb “ought” expresses something which is generally accepted or naturally expected under the circumstances.

“Shall” is still used to express obligation with the second and third person, but at present this use is restricted to formal or even archaic style and is mainly found in subordinate clauses (e.g. It has been decided that the second reading shall not be opposed). The verb “shall” is used only with the indefinite infinitive. At present it is generally used to express threats, warnings, promise.

Meaning

Forms of the modal verbs

Other was of expressing the same meaning

Sentence patterns

Promise (in statements and negatives)

Smb shall do; smb shan’t do

You are sure to get …

Don’t worry, you shall have a minute’s rest before the meeting begins.

Threat and warning (in statements and negatives)

Smb shall do; smb shan’t do

_

You shall be sorry. Put on your warm coat or you shall be sick.

Asking for instructions (in questions)

Shall smb do smth?

Must I do it? Do you want me to do it? Am I to do it?

Shall I read the text again? Shall I do it?

Advice and mild obligation (in statements, questions and negatives)

Shouldn’t smb do…?

Should smb do …?

Ought smb to do…?

Oughtn’t smb to do smth?

_

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

Criticism of a past action (in statements and negatives)

Should have done

Shouldn’t have done

Ought to have done

Oughtn’t to have done

_

You ought to / should be speaking more clearly.

You oughtn’t to / shouldn’t have done it.

Supposition implying probability (in statements and negatives)

Should do

Shouldn’t do

Ought to do

Oughtn’t to do

Very likely …;

It’s likely smb …;

Most likely smb …;

Very probably smb ;

I think it’s probable that …;

Probably not…;

It’s unlikely that …;

I don’t think smb …

Our guests should (ought to) be here soon (if they haven’t got lost).

This homework shouldn’t (oughtn’t to) take you too long (if you’ve understood what you have to do).

You should pass the exam (you’ve worked hard).

Emotional “should” (mostly in questions)

Why should smb do smth?

Why should smb have done smth?

_

Why should I go there?

Why should he have told you the truth?

Note:

  1. In its meaning of promise shall refers only to the future. In indirect speech the form should is used to denote a relatively future action.

  2. Ought in its suppositional meaning is used to express probability about the present or future only.