____________________
,
____________________
,
and
____________________
are
modal
verbs
(
See
Modal
Verbs
)
,
which
are
a
form
of
auxiliary
verbs
(
See
Auxiliary
Verbs
)
.
They
are
used
before
other
verbs
to
show
ability
or
possibility
.
In
statements
(
see
below
about
questions
)
,
____________________
is
used
to
talk
about
the
present
or
the
future
(
ex
.
I
____________________
speak
Japanese
)
.
____________________
is
used
to
talk
about
the
past
(
ex
.
She
____________________
walk
when
she
was
only
2
years
old
.
)
.
____________________
and
____________________
are
often
used
to
make
requests
.
____________________
is
more
informal
(
____________________
you
pass
me
the
salt
?
)
____________________
is
more
formal
and
polite
(
____________________
you
take
care
of
our
dog
while
we
are
on
vacation
?
)
____________________
and
____________________
are
also
used
sometimes
to
ask
for
permission
.
Like
with
requests
,
____________________
is
more
informal
and
____________________
is
more
formal
.
Even
more
formal
is
____________________
(
ex
.
____________________
I
use
the
restroom
?
)
In
fact
,
some
people
believe
that
using
____________________
and
____________________
for
asking
permission
are
not
correct
.
However
,
in
recent
years
,
it
has
become
common
.
____________________
is
also
used
to
offer
help
.
____________________
is
not
usually
used
in
this
way
.
