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2021年1月30日发(作者：靁)
be
动词，情态动词，助动词
do/does
的用法区别及练习

1.
由连系
am
，
is
，
are
构成的句子：变一般疑问句时把
am
，
is
，
are
提到 句
子的前面，
句尾用问号即可。
变否定句时直接在
am
，
i s
，
are
后面加
not
即可。
例如：

肯定句
:He is a student.
一般疑问句
: Is he a student?
否定句
: He is not a student.
画线提问
:
对
he
提问
: Who is a student?
对
a student
提问
: What is he? or What does he do?

2.
由情态动词
can,
may,
should
等构成的句子
:
变一般疑问句时把
can,may,
提到句子的前面
,
句尾用问号即可
.
变否定句时直接在
ca n,may,
后面加
not
即
可
.
例如
:
肯定句
: She can swim.
一般疑问句
: Can she swim?
否定句
: She cannot swim.
画线提问
:
对
she
提问
: Who can swim?
对
swim
提问
: What can she do
？


3.
由行为动词构成的句子
:
需要加助词
do
或
does.
变一般疑问句时把
do/does
放在句子前面
.
变否定句时把< br>don’t/doesn’t
放在动词的前面。要注意观察
动词的形式并对号入座。一般 疑问句和否定句的动词三单式都要变回原型。

play-----do plays-----does

例如
:
肯定句
: They play football after school. He plays football after school.
一般疑问句
:
Do
they
play
football
after
school? Does
he play football
after school?
否
定
句
:
They
don't
(do
not)
play
football
after
school. He
doesn’t’
play football after school.
画线提问
:
对
they/he
提问
: Who plays football after school?
对
play
football
提
问
:
What
do
they
do
after
school? What
does
he do after school?
对
after
school
提
问
:
When
do
they
play
football? When
does
he play football?

针对性练习


按要求改写句子：

1. I know the answer.(
一般疑问句
)
______ ______ __________the answer?
2. We can see some birds.(
一般疑问句
)

______ ______ see ______ birds?
3. He designs clothes.(
一般疑问句
)
______ he ________ clothes?
4. There are some flowers on the teachers’ desk.(一般疑问句
)
______ ______ ______ flowers on the teachers’ desk?

5. There are some apples on the tree.(
否定句
)
There ______ ______ ______ apples on the tree.
6. I think he is very old.(
否定句
)
I ______ think he ______ very old.
7. Please colour it green.(
否定句
)
______ ______ colour it green.
8. These doctors are helpful.(
变否定句
)
______ _______ ______ __________.
9. You may have some hot dogs.(
一般疑问句
)
_______ ______ ______ ______ ________?.
10. There aren’t any pears in the box.(同义句
)


There are ______ pears in the box.
sign means
“No smoking”.


What ______ this sign _________?
12. She looks young.
（改一般疑问句）

________ she _______ young?
13. She is young.
（改为一般疑问句）

______ ______ ____________?
14. My pencils are in the pencil-box.(
对划线部分提问
)

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