-
?
1.
表能力、能够
(
现在,过去时
)
?
Some of us can use the computer now,
but we
couldn’t
last
year.
?
2. can
表请求和许可
?
1)
表请求时,口语中常用
could
代替
can
使语
< br>气更委婉,回答时用
can
?
--- Can/Could I
use your dictionary
?
---Yes,
you can. No, you can’t.
?
2)
表示“许可”,可与
may
换用
?
You can go home
now.
?
3.
表推测。
表惊讶、怀疑、不相信。用于否定
,
疑问句和感叹句。
?
I am
sure you can't play it well.
?
How can you say
that
?
惊异,不相信
?
4.
客观可能性
常用于肯定的陈述句中,表示理论
上的或习惯上的可能性
,
”有时可能会”,不涉及具
体事件。
?
Everybody can
make mistakes.
?
5. could + have + done
本可以做但
没做表示对
过去能做而未做的事情感到惋惜,遗憾
Could not
have done
不可能做
?
It’s a
pit
y. Your class could have got the
first prize.
?
If he studied
hard recently
,
he couldn't
have failed the exam.
一.
May
、
might
1)
表示允许或征询对方许可,
允许,有“可以”之
意,
一般疑问句否定回答用
can
’
< br>t/mustn
’
t
。
在
请求对方许可时,如果
Might
I
…
就比用
May
I
…
语气更婉转些,
May I
have a dance with you
--Yes
,
you
may/can.
--
No,
you can’t/mustn’t.
(2)
表示推测,可能性,
多用于肯,否句,“或
许”、“可能”之意,如果用
might
表示可能性更
小,
may/might have done
表示对过去的事情进行
可能的猜测
They may be in the library
now.
Mary may have gone to
the concert last night.
3
)
.may
表祝愿
May you succeed
三.
Must
?
(1)must
< br>表示义务或强烈的劝告说话人主观上
“必须”、“应该”之意,其否定式
must
not
,缩
写形式为
mustn
‘
t
,表示“不应
该”,“不准”、
“不许可”或“禁止”之意
?
We must study
hard and make progress
every day.
?
You
mustn‘t touch the fire.
?
(2)
以
must
提出的疑问句否定回答用<
/p>
needn't
或用
don't
(doesn't) have to (
不
必
)
来回答,
而不用
mustn't
,
mustn't
表示的是“禁止”或“不
许可”之意,
?
---Must we
finish the work tomorrow
---
No, you needn’t/ don’t
have to, but you
must finish it in
three days.
?
(
3
)
must
p>
:表推测用于肯定句(十分肯定)
“一定…,肯定…”
Betty must be in the next
room.
?
4
)
.
表某人非得或偏偏做某事
?
Must you make
so much noise
四.
Will
?
(1)will
< br>用于第二人称疑问句,表请求或征求
意见,
would
语气委婉
?
1)Will you lend
me your book
?
2) Would you like a cup of
tea
?
(2)
用于各人称,可以表示“意志”或“决
心”,(
would
用于过去情况)
?
I
will be right here waiting for you.
?
I would go with
him if he saved my
brother.
?
(3)will
< br>可以表示一种习惯性的动作或某种倾
向,有“总是”或“会要”之意,
would
可以表示
过去的习惯动作,比
used to
正式,并没有“现已无
此习惯
”的含义
?
Every morning he will have a walk along
this river.
?
Every evening,
she would sit by window,
deep in
thought.
?
4)
多用于否定句中,表示“不肯、就是不
?
This door won’t open.
?
(
5
p>
)表示公用能力“能”
?
The room will
seat 100 persons.
?
(
6
p>
)表猜测,
will
主要用于第二、三人称
,
will be(
对目前情况的推测
)
,
will have done(
将来
完成
)
。
would
表料想或猜想,
would have
done
本想
做而没做
?
Maybe by then you will have changed
your mind.
?
五。
Shall
?
1. shall
用于一、三人称疑问句。征求意见
或请求。
?
Shall we dance
?
2.
Shall
用于二、三人称:表说话人给对方
的许诺、命令”
、“警告”、“强制”、“威胁”
...
?
He shall go
first, whether he wants to
or
not.
?
If you do well in your study, you shall
get a gift.
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