-
Unit9
Can you come
to my party?
话题：
Invitations
教学目标：
1. Learn
how to make, accept, decline invitation.
2. Talk about obligations
with
“
have
to
”
3. Talk about
the schedule.
教学重难点：
情态动词
Can
的用法
知识点：
1.
情态动词
can
情态动词是一种本身有一定的词义，
表示说话人的情绪、
态度或语气的动词，
但不能单独作
谓语，
只能和其他动词原形构成复合谓语，
没有人称和数的变化情态动词数
量不多，
但用途
广泛，主要有：
can
(could), may (might), must, need, ought to, dare
(dared), shall (should), will
(would)
can
是一个常见的情态动词
1
含义
5
点
○
1)
表示能力（如体力和脑力方面），意为“能、会”
Can you speak Chinese?
Can you play basketball?
2)
表示请求或者允许，多用在口语中，意为“可以、能”等客观条
件的允许。用于疑问句中
用来提出要求，用于否定句中表示不允许。
Can you help me?
You can
’
t play
the computer
3)
表示可能，理论上的可能
He can be out now.
It can
’
t bu sunny
all the time.
4)
表示说话人的猜测、怀疑、
不肯定等，主要用于否定句、疑问句、感叹句中，带哟感情色
彩。
How can yo be so rude!
Can he be back?
5)could
可以作为
can
的过去
式，也可以在提出请求时表示委婉。
He could
save the little boy.
Could
you help me?
拓展
辨析
can
与
may
4
点
1)
表
示“许可、准许”，此时与
can
同义，可以互换使用
You
may/can
go
to the
cinema
this
evening.
☆注意：
表许可时其答语可以用
“
Yes,you may.
”
但是由于用
may
做肯定回答语气显得生硬、
严肃，因此
一般用
Yes, please.
/Certainly. / Of course.
这些回答显得热情、客气。拒绝对
方时，其答语可
以用
No, you
mustn
’
t. / No, you
can
’
t. / Sorry, you
can
’
t. / No, please
don
’
t
--May I
come in?
--Yes, please
--May I use your ruler?
--Certainly. Here you are.
2)
表示可能性时，常用在肯定句中
，意为“可能、也许”
He may be very
busy now.
He said that she
might not be at work today.
3)can
和
may
都可以表示推测
。
can
通常用在否定句和疑问句中，
may
通常用在肯定句和否
定句中。虽然两者都可以用于否定句
，但是程度不同，
can
’
t
的语气比
may
not
更强。
It
can
’
t be true.
It may not be true.
4)
表示希望、祈求、祝愿，常可以译为“祝愿”
May you have a good time.
May you be happy.
练习题
1)
—
Would you like to go swimming with me
this afternoon?
—
I
’
d love to, but
I
’
m afraid I _______. I have
too much work to do.
2)
—
________ I use
your dictionary?
—
Of course you can.
3)
—
________ I know your name?
—
Sure. My name
is Han Huimei.
4) I
don
’
t understand this
sentence. ________ you explain it to me?
5)
—
That sweater _______ be yours.
—
No, it _______ be mine. Mine is over
there.
6) Jim left his English book at
home. He _______ borrow one from other students.
7)_______ you have a merry
Christmas and happy New Year!
8)
—
May I pick a
flower in the garden?
—
No, you _______.
2.
must
与
have to
表示义务，即必须或者不得不做的事
表示“必须、一定要”，多强调说话人的主观看法，否定式
mustn
< br>’
t
表示“一定不要，禁止”
You must see the doctor.
Must you go soon?
对于
must
开头的一般疑问句，如果要做否定回答，可以
用
needn
’
t,
don
’
t have to
，不能用
mustn
’
t
--Must I come over tonight?
--No, you
needn
’
t
表示客观需要时，常用
have
to,
have
to
为情态动词词组，第三人称单数为
has
to.
过去式为
had to.
Have to
的疑问句，否定句都要借助于助动词
do,
来完成。
Eg. He has to
stay at home.
他不得不呆在家里。
Why
do I have to do everything?
为什么事事都得我来干。
练习题
1)You _______
swim in this part of the lake.
It
’
s dangerous.
2)
—
________ I tell him the truth right
now?
—
No, you
________. You can tell him about it later.
3)---Do we mush finish our homework
this afternoon?
---Yes, you______.
4)
我不必呆在这里。
_______________
__________________________________________________
__________
5)
杰克生病了，他不得不呆在家里。
e
v.
做好准备，把……准备好
eg.
My mother always prepares a big breakfast for me
every morning.
妈妈每天早上总是为我准备一顿丰盛的早餐。
1
为……做准备
○
prepare for
为……做准备
make preparations for
get ready for
……
teacher told them to prepare for the
coming speech contest.
The smiths are
making preparations for this journey.
2
准备去做
○
prepare to do sth.
准备去做……
get ready
to do
Make preparations to do
3
prepare sb. for
使某人为……而准备
○
We
must prepare him for the bad news.
我们必须使他为这个坏消息做好准备。
4
be prepared for/ to do
○
They are prepared for anything that
might happen.
他们已准备好了应对任何可能发生的事情。
5
preparation
准备，准备工作
可数名词
○
6
be in
preparation
正在准备中
○
Her
daughter
’
s wedding is in
preparation.
她女儿的婚礼正在准备中。
that
以至于，以便于
little boy saved every coin so that he
could buy his mother a present on
Mother
’
s
Day.
这个小男孩省下每一枚硬币，这样才能在母亲节那天
给他的妈妈买份礼物。
1)
辨析
so that
与
so
…
that