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SECTION 1
Must
is used:
·
for obligation when there is no choice
·
when we express the authority of the speaker
·
for orders
·
for prohibitions (
mustn’t
)
·
for deductions usually surprising – when you are sure that something is true (
You must be joking!
).
Must
is a modal verb as it does not exist in all tenses, in these cases it is replaced by
have to
. It has no
continuous forms.
Have to
(it is not a modal verb, but replaces
must
in some tenses. There are also slight differences in use) is
used:
·
to express the authority of another person, a law
·
to give advice that should be listened to
·
when external circumstances make something necessary
·
when something is not necessary
have to
is used in the negative form (
don’t have to
)
·
to replace
must
in tenses where it does not exist
·
with preference in questions.
Should
is used:
·
to give advice
·
to express mild obligations
·
to ask for or give an opinion
·
to say that something is not right, or not what we expected
·
to say that something will probably happen but that there is a some doubt.
1
State the functions of
must
,
have to
and
should
in these sentences.
a
You
should
see a dentist for a check-up.
b
I
have to
be at work at 8 o’clock every day.
c
You can’t go out this afternoon; you
must
stay in to study.
d
We don’t
have to
wear uniforms at school.
e
You
shouldn’t
eat sugar if you want to lose weight.
f
You
mustn’t
eat so much sugar, you are diabetic.
2
Use
have to
,
must
or
should
to complete these sentences.
a
Remember, you
................................
be back at 11 o’clock.
b
You
................................
study more if you want to pass your
exams.
c
You
................................
wear a crash helmet on motorbikes.
d
You
................................
the appropriate components in a circuit
to avoid incidents.
e
You
................................
look into the facts before judging!
Modal Verbs – Instructions, advice and orders
WORKING ON GRAMMAR
REMEMBER!
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