They
____________________
walking
home
(
+
)
.
I
____________________
talking
to
Alan
(
-
)
.
____________________
you
playing
golf
?
____________________
was
he
living
?
My
friends
____________________
smoking
(
-
)
.
What
____________________
your
sister
doing
?
The
cat
____________________
sleeping
(
+
)
.
It
____________________
snowing
(
-
)
.
Where
____________________
they
going
?
Who
____________________
cutting
the
tree
?
