牛津译林版英语八年级上Unit8 Natural disasters Grammar ：Past Continuous tense教案（1课时）

Unit
8
Natural
disasters
教案
第4课时
Grammar
Teaching
aims:
1.
To
recognize
the
past
continuous
tense.
2.
To
become
familiar
with
the
of
structure
of
the
past
continuous
tense
3.
To
recognize
the
past
continuous
tense
with
‘while’
and
‘when’
and
‘as’
4.
To
become
familiar
with
the
structure
of
the
past
continuous
tense
with
‘while’
and
‘when’
and
‘as’.
Step
1
Presentation
Enjoy
the
picture
and
present
the
present
continuous
tense.
Step
2
Lead
in
Enjoy
more
pictures
and
talk
about
the
past
continuous
tense.
Step
3
Explanation
1.
过去进行时主要表示：
?
在过去某一时刻正在进行的动作
（a）
They
were
eating
breakfast
at
7:00
a.m.yesterday.
（b）
I
was
writing
a
letter
at
this
time
yesterday.
（c）
Five
minutes
ago,
Danny
was
looking
out
of
the
window
and
Suzy
was
reading
a
book.
?
在过去某段时间一直在进行的动作
（a）
From
1983
to
1998,
he
was
teaching
at
Yale.
（b）
They
were
building
a
dam
last
winter.
2.
过去进行时的句式
（1）基本结构：was
/
were
+
V-ing
（2）肯定句:
I
was
reading
a
newspaper
at
that
time.
They
were
playing
football
at
five
yesterday
afternoon.
主语
+
______________________
主语+was
/
were
+
V-ing
（3）否定句：
Zhang
Li
wasn’t
doing
homework
when
I
came
back.
Sam
and
David
weren’t
looking
at
Miss
Kim
while
she
was
drawing
on
the
blackboard.
主语
+
______________________
was
not
=
wasn’t
were
not
=
weren’t
was
/
were
not
+
V-ing
was
not
=
wasn’t
were
not
=
weren’t
（4）疑问句：
—Were
you
watching
TV
at
home
at
9
o’clock
yesterday
evening?
—Yes,
I
was.
—Was
Xu
Jia
running
when
you
saw
her?
—No,
she
wasn’t.
Was
/
Were
+主语+v-ing?
肯定回答：Yes,
_________________.
否定回答：No,
_____________________.
（5）特殊疑问句：
What
were
you
doing
at
8:00last
night?
疑问词+was/were
+主语
+V-ing…
Step
4
Exercises
Complete
the
conversation
on
page
97.
A
snowstorm
hit
Sunshine
Town.
Mr.
Wu
is
asking
the
students
about
it.
Complete
their
conversation
with
the
correct
forms
of
the
verbs
in
brackets.
Mr.
Wu:
What
a
terrible
snowstorm!
It
started
at
about
seven
this
morning.
I
___________
(read)
the
newspaper
then.
What
_____
you
______
(do),
Simon?
Simon:
I
___________
(have)
breakfast.
Mr.
Wu:
What
about
you,
Millie?
Millie:
I
____________
(walk)
to
the
bus
stop.
Sandy,
I
saw
you
and
your
parents
standing
on
the
side
of
the
road.
_____
you
_______
(wait)
for
a
taxi?
Sandy:
Yes.
My
dad’s
car
broke
down
because
of
the
cold
weather.
He
___________
(ring)
someone
to
come
and
help
when
you
saw
me.
Check
the
answers.
Step
5
Presentation
Show
some
sentences
and
present
the
usage
of
‘when’
/
‘while’
/
‘as’.
Step
6
Explanation
while,
when
and
as都表示“当……的时候”。
1.
while指某一段时间，从句的谓语动词必须是延续性的。
e.g.
While
I
was
watching
TV,
he
was
listening
to
music.
Millie
was
reading
a
book
while
Eddie
was
sleeping.
2.
when和as
既可以指某一时间点，又可以指某一段时间，从句的谓语动词既可以是延续性的，又可以是瞬间性的
e.g.
When
/
As
he
woke
up,
it
was
eight
o’clock.
3.
指一段时间时，when、while和as都可用
e.g.
When/
While/
As
I
was
waiting
ofr
a
bus,
I
met
her.
以过去的时态为例，
主、从句动作关系
连词选择
时态
例句
主、从句动作同时发生，而且从句谓语动词为延续性动词
when;while;as
主句：一般过去时从句：过去进行时
When
/
While
/
As
I
was
walking
in
the
street,
a
car
caught
fire.
主、从句动作同时发生;
主句动作发生的时候，从句动作正在进行
While;as
主句：一般过去时从句：过去进行时
The
earthquakehappened
while
/
aswe
were
havingclass.
主、从句动作同时进行
while
主句：过去进行时从句：过去进行时
Ruby
was
reading
abook
while
hismother
was
cooking.
从句动作发生的时候，主句动作正在进行
when
主句：过去进行时从句：一般过去时
When
I
came
backhome,
my
motherwas
sleeping
in
thesofa.
从句动作表示主句动作发生的背景或条件
as
主句：一般过去时从句：一般过去时
As
the
day
went
on,the
weather
gotworse.
Step
7
Exercises
Do
the
exercises
on
page
98.
Some
Class
1,
Grade
8
students
went
to
play
in
the
snow.
Complete
the
sentences
with
the
correct
forms
of
the
verbs
in
blanks.
Use
when,
while
and
as
to
connect
the
sentences.
1.
_______
Simon
_________
(arrive),
Amy
___________
(get)
some
snow
from
the
ground.
2.
_______________
Suzy
and
Kitty
____________
(build)
a
snowman,
Millie
___________
(take)
photos.
3.
Daniel
_______
(fall)
over
_____________
he
____________
(make)
a
big
snowball.
4.
Peter
__________
(hide)
behind
a
tree
______
a
snowball
____
(hit)
him.
5.
______________
Millie
and
her
classmates
____________
(play)
in
the
snow,
Andy
____
(run)
towards
them.
Check
the
answers.
Do
more
exercises.
Homework
1.
Remember
the
new
words
in
this
lesson.
2.
Do
the
exercises
on
the
workbook.