This topic is rather boring so here you are some exercises...
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PRESENT SIMPLE
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HAVE TO / HAS TO
( also have got to…)
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General (external) obligation /
rules / laws
Some external circumstance makes
the obligation necessary
Impersonal ‘you’ – ( ‘you’ mean ‘people in general’)
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MUST
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Your own obligation / personal obligation / rules
Some personal circumstance makes
the obligation necessary (and the speaker almost certainly agrees with the
obligation.)
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DON’T
HAVE TO
DOESN’T
HAVE TO
(also haven’t got to …)
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It is not necessary / there is
no obligation
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MUSTN’T
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Prohibition
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