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obligationpast simpe
·present sub+v2(didn't)
have/need to accions acabat
must temps concret
·past
had/needed to present p
no obligation sub+has/ve+v3
·present acions no acabat
don't doesn't temps no concret
have/need to
·past presnt s
didn't have/ sub+v(s)
need to habits situcio real
Ability permition
·present presnt c
can,'s/'m/'re sub+'s/'m/'re
allowed to +v+ing
·past acionsen progres ara
could,was/were
allowed to
·future
will be hable to
will be allowed to
Prohibition
·present
mustn't
·Present
should,ought to