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Modal verbsofdeduction
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can
can’t
will /
won’t
shall may must
could would should might -
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Is Sally at home now?
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we use indicative tenses
to say what we know
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Sally is at home now.
I know
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we use modals when we
suppose, deduce, imagine
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Sally must be at home now.
I suppose
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the choice of modal verb says
how certain we are
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Sally
must
will
may
might
won’t
can’t
be at home now.
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Sally
must
will
may
might
won’t
can’t
be at home now.
I’m convinced
(even if I don’t
know)
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Sally
must
will
may
might
won’t
can’t
be at home now.
I suppose
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Sally
must
will
may
might
won’t
can’t
be at home now.
it’s possible
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Sally
must
will
may
might
won’t
can’t
be at home now.
c.f. modal verbs
of possibility
(last lesson)
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Sally
must
will
may
might
won’t
can’t
be at home now.
I suppose she
isn’t
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Sally
must
will
may
might
won’t
can’t
be at home now.
I’m sure she isn’t
(even if I don’t
know)
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notice the opposites
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Sally must be at home now.
Sally can’t be at home now.
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Sally will be at home now.
Sally won’t be at home now.
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1. when we don’t know
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Theymay
mighthave lost my letter.
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Theymay
mighthave lost my letter.
it’s possible that
they have lost my
letter
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Theymay
mighthave lost my letter.
‘may’ and ‘might’
mean the same