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Modal Verbs of Obligation and Prohibition (Must (written rules and…
Modal Verbs of Obligation and Prohibition
Must
written rules and instructions
when the obligation comes from the speaker ( in advertising)
to give your opinion (to say what you think is necessary)
must is never used to talk about the past (use have to instead).
Should
to give advice
to give an opinion (often used with verbs think, suppose, reckon, etc.)
to say that we expect something to happen
should doesn't have past form but it can be replaced by was / were supposed to
Have to
to say what someone is obliged to do (the speaker is not giving their opinion)
instead of must in all its meanings but only in spoken English
don't / doesn't have to
didn't have to
won't have to
you don't need to do it (but you can if you want)
Mustn't
something is prohibited, not allowed
Shouldn't
recommendation