推荐回答（1个）
1.
They
came
to
China
in
1990.(变一般疑问句)
Did
they
come
to
China
in
1990?
2.
I
was
ill
for
two
days
last
week?
(同上)
were
you
ill
for
two
days
last
week?
3.
The
twins
go
to
school
on
foot
every
day.
(同上)
DO
the
twins
go
to
school
on
foot
every
day?
4.
She
washed
the
clothes
last
Sunday.
(
变否定句)
She
didn't
wash
the
clothes
last
Sunday.
5.
She
is
going
to
shopping
tomorrow.
(变否定句)
She
isn't
going
to
shopping
tomorrow.
6.
My
mother
likes
her
students.
(变一般疑问句)
Does
My
mother
like
her
students?_________________________________
7.
Do
you
watch
TV
on
Sunday?
(用last
Sunday
改写成过去时态的句子)
Did
you
watch
TV
on
Sunday?
8.
Wei
Hua
bought
a
new
pen
yesterday.
(变否定句)
She
diidn't
buy
a
new
pen
yesterday.
9.
We
had
a
meeting
the
day
before
yesterday.
(变一般疑问句)
Did
you
have
a
meeting
the
day
before
yesterday?
10.
They
had
a
good
time
last
Sunday.
Did
the
twins
have
a
good
time?
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