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OBLIGATION - Coggle Diagram
OBLIGATION
must
something we need to do
something we know internally that is our obligation
I must take shower.
I must go to the hairdresser.
+, ?
the opposite of must: don't have to
only at present
have to
I have to send tax return by the 25th every month.
external obligation (law, rule)
must (negative, future, past)
shouldn't
it's not a good idea
shouldn't + have+ past participle (3)
I shouldn't have done it.
should
it's a good idea/ practice/ recommended
have + past participle (3)
You should have gone to a doctor yesterday.
PROHIBITION
mustn't
you mustn't drive at the red light