You have to do it. - It is obligatory/necessary. The rules says so., You must do it. - It is necessary. You feel it's necessary., You don't have to it. / You needn't do it. - It is not necessary., You mustn't do it. - It is prohibited (forbidden)., You can do it. - You have the permission., You can't do it. - You don't have permission.,

Modals for obligation and permisson: match the sentences with the description.

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