Necessity
Modals
You
can
use
____________________
(
not
)
,
____________________
(
not
)
to
,
and
____________________
____________________
(
not
)
to
say
what
is
____________________
.
Use
____________________
____________________
in
specific
situations
.
You
____________________
/
____________________
to
check
the
equipment
before
a
presentation
.
You
____________________
begin
until
you
check
it
.
You'd
____________________
get
going
-
it's
almost
10
:
30
.
____________________
better
not
____________________
late
for
class
again
.
Use
____________________
(
not
)
to
say
what
is
necessary
.
____________________
is
mainly
used
in
formal
____________________
and
____________________
.
You
____________________
____________________
off
your
cell
phone
before
the
lecture
.
You
____________________
____________________
____________________
a
cell
phone
during
the
lecture
.
You
can
use
____________________
to
and
____________________
to
to
say
what
is
____________________
in
the
affirmative
.
In
the
negative
,
however
,
these
expressions
are
used
to
say
what
is
____________________
____________________
.
You
____________________
____________________
/
____________________
____________________
carry
a
driver's
license
when
you
drive
.
=
It's
necessary
.
But
you
____________________
____________________
____________________
/
____________________
____________________
____________________
carry
your
passport
.
=
It's
not
necessary
.
