I
would have counterchecked
you
would have counterchecked
he / she / it
would have counterchecked
we
would have counterchecked
you
would have counterchecked
they
would have counterchecked
I
would have been counterchecking
you
would have been counterchecking
he / she / it
would have been counterchecking
we
would have been counterchecking
you
would have been counterchecking
they
would have been counterchecking