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thank u in advance :-P
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Must : Certainty

Should : recommendation,obligation or probability

Examples:

You must take some time off and get some rest.

You should have taken some time off last week to get some rest.
Hello, and welcome to the Forums, Anilmanu!

Yes, "should" expresses a piece of advice, a recommandation "you should get some rest" (that's my opinion, I'm advising you)

In this context however, "must" expresses an obligation: "you must get some rest" (you have to, you are obliged to)
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the should is advice. but must is necessary. The must is more necessary than should.

e.g. there should be a park for children. this is advice

but you must'nt smoke here . This is necessary.

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Yes, "must" expresses a necessity; "mustn't" even expresses an interdiction.
You use must when the recipient of the instruction has obligation to follow the instruction

Should is a suggestion
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Must can also be a suggestion, just a more forceful one than should.
As far as the meaning of these two words are concerned it is same. The difference however lies in who is using it. For example I use the the word 'should' to give some body else an advise or suggestion. But I use the word 'must' to tell myself for doing something. So when the compulsion is for oneself it is 'must' and when it is for the others it is 'should'.

A learner of the language.
As far as the meaning of these two words are concerned it is same. The difference however lies in who is using it. For example I use the the word 'should' to give some body else an advise or suggestion. But I use the word 'must' to tell myself for doing something. So when the compulsion is for oneself it is 'must' and when it is for the others it is 'should'.

A learner of the language.
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