My
friend
called
me
last
night
.
I
was
asleep
at
the
time
of
the
call
.
I
still
heard
that
my
phone
was
ringing
but
I
couldn't
get
up
and
pick
it
up
.
In
the
morning
,
when
I
woke
up
I
saw
that
my
friend
was
online
.
We
started
exchanging
messages
.
And
here
is
our
message
history
:
-
Why
didn't
you
return
my
call
last
night
?
-
I
____________________
____________________
returned
your
call
last
night
if
I
____________________
____________________
been
asleep
.
-
Why
did
you
go
to
bed
so
early
?
-
I
____________________
____________________
have
____________________
to
bed
so
early
if
I
had
not
been
tired
.
-
What
did
you
do
to
be
tired
?
-
I
____________________
____________________
have
been
tired
if
I
had
not
been
studying
so
much
.
-
Wow
,
why
did
you
study
so
much
?
-
I
____________________
____________________
have
studied
so
much
if
I
had
not
____________________
an
exam
after
2
days
.
-
Why
do
you
reply
to
me
in
this
weird
way
-
I
would
not
____________________
replied
to
you
in
this
way
____________________
I
had
not
had
an
English
exam
and
I'm
practicing
third
conditional
at
the
moment
.
-
Oh
,
wow
,
what
is
third
conditional
?
-
Third
conditional
is
used
to
talk
about
the
past
and
to
imagine
something
different
from
what
actually
happened
.
-
Do
you
mean
we
can
use
it
to
express
regret
?
-
Sure
and
to
make
up
excuses
I've
just
made
up
all
of
these
answers
in
order
to
practice
the
third
conditional
.
-
Wow
-
And
I
want
to
know
,
why
didn't
you
bring
me
apples
?
-
Now
,
it
is
my
turn
to
make
up
excuses
,
right
?
