.一般过去时
概念：过去某个时间里发生的动作或状态；过去习惯性、经常性的动作、行为。
2.时间状语：ago,
yesterday,
the
day
before
yesterday,
last
week(year,
night,
month…),
in
1989,
just
now,
at
the
age
of
5,
one
day,
long
long
ago,
once
upon
a
time,
etc.
3.基本结构：be动词；行为动词
4.否定形式：was/were+not;在行为动词前加didn't，同时还原行为动词。
5.一般疑问句：was或were放于句首；用助动词do的过去式did
提问，同时还原行为动词。
6.例句：she
often
came
to
help
us
in
those
days.
i
didn't
know
you
were
so
busy.
过去完成时：
1.概念：以过去某个时间为标准，在此以前发生的动作或行为，或在过去某动作之前完成的行为，即“过去的过去”。
2.时间状语：before,
by
the
end
of
last
year(term,
month…),etc.
3.基本结构：had
+
done.
4.否定形式：had
+
not
+
done.
5.一般疑问句：had放于句首。
6.例句：as
soon
as
we
got
to
the
station,
the
train
had
left.
by
the
end
of
last
month.
we
had
reviewed
four
books
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