I
____________________
been
thinking
how
to
build
an
airplane
.
They
____________________
been
looking
for
a
new
car
.
We
____________________
been
studying
hard
this
semester
.
Maria
____________________
been
running
for
half
an
hour
.
I
____________________
been
thinking
of
you
all
of
week
My
sister
____________________
been
working
since
yesterday
Carlos
____________________
been
teaching
english
at
school
They
____________________
been
playing
soccer
since
children
She
____________________
been
eating
all
week
He
____________________
been
coming
to
the
universit
y
