过去的过去是过去进行时，对现在没有影响；现在进行时是以前发生的对现在有一定影响。比如一个过去完成式，It's
nine
o'clock
now,I
had
finished
my
homework
by
eight
o'clock。八点是九点之前的一个时间段，所以是过去进行时
过去完成时是指在过去的某个时间点以前已经发生完的动作，例，Mary
had
finished
her
homework
before
he
father
came
back
home.
而现在完成时是指在现在时的状况下已经完成的动作，并对现在产生一定的影响，例，Mary
has
finished
her
homework
and
her
father
agrees
to
let
he
watch
TV.希望对你有帮助~
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