OUGHT TO AND SHOULD

WE USE OUGHT TO TO GIVE ADVICE OR TO EXPRESS MORAL DUTY.

Giving advice and talking about necessity 

We can use should / ought to / have to / must + the base form of a verb to give advice and talk about necessity. 

Should and ought to are less strong and less formal than have to and must.

 less strong / less formal stronger / more formal

 should  -  ought  to -   have to -   must     

Should and ought to

 We use should / should not (shouldn’t) and ought to / ought not to (oughtn’t to) to say whether something is a good idea.

Should and ought to are similar in meaning, but should is less formal and more common, especially in negative forms and questions. 

You should / ought to take a walk after each meal. 

They should not (shouldn’t) / ought not to (oughtn’t to) park their car there

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 SOUNDS AND MUCH MORE