163.-Diferencias entre must not y don’t have to. First Certificate

 

BE CAREFUL. THERE IS A DIFFERENCE IN MEANING BETWEEN MUSTN'T AND DON’T HAVE TO

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Mustn't

It is prohibited.

It is not allowed.

It is important that you do NOT do something.

 

 

 

Don't have to

There is no obligation.

You are not required to do something, especially if you don't want to.

 

 

Negative Obligation

​​ Absence of Obligation

You must not drink that

You don't have to drink that.

= It is forbidden to drink that.

= Don't drink that, it is not allowed.

= It is important that you do NOT drink that.

= You don't need to drink that but

= you can if you want to

=There is no obligation to drink that. You decide if you want to.

 

You mustn't tell John

You don't have to tell John.

​​ = Do NOT tell John.

= You are not allowed to tell John. .

= You can tell John if you want to but it is not necessary.

She mustn't come.

She doesn't have to come.

= It is important that she does NOT come

= She is not required to come but she can if she wants to.

 

 

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