I
went
to
the
USA.
一般过去时
I
didn't
go
to
the
USA.
一般过去时否定句
Did
you
go
to
the
USA?
一般过去时疑问句
I
did
my
homework.
一般过去时
Ididn't
do
my
homework.
一般过去时否定句
Did
you
do
your
homework?
一般过去时疑问句
I
was
doing
my
homework.
过去进行时
I
wasn't
doing
my
homework
过去进行时否定句
Were
you
doing
your
homework?
过去进行时疑问句
特殊疑问句
what
was
he
saying
yesterday?他昨天说什么？
一般疑问句
were
they
doing
their
homework
at
that
moment?他们在那时做作业了吗？
肯定句
i
was
finishing
my
homework
at
night.我昨天晚上写完我作业了,
否定句
she
wasn't
watching
tv
at
that
time.
她在那时没有看电视.
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