1
.
She
is
____________________
(
walk
)
in
the
park
.
(
Present
progressive
)
2
.
They
was
____________________
(
talk
)
about
my
birthday
.
(
Past
progressive
)
3
.
I
____________________
(
to
be
)
thinking
of
you
.
(
Past
progressive
)
4
.
You
____________________
(
to
be
)
writing
a
letter
.
(
Present
progresive
)
