Unit 7 Teenagers should be allowed to choose their own clothes.Section A (grammar-4c)课件(共24张PPT)

(共24张PPT)
Unit
7
Teenagers
should
be
allowed
to
choose
their
own
clothes.
Section
A
(grammar-4c)
School
rules
Don’t
arrive
late
for
school.
=
Students
are
not
allowed
to
arrive
late
for
school.
Don’t
run
in
the
hallways.
School
rules
=
Students
are
not
allowed
to
run
in
the
hallways.
School
rules
=
Students
are
not
allowed
to
eat
in
the
classroom.
Don’t
eat
in
the
classroom.
School
rules
Don’t
listen
to
music
in
the
classroom.
=
Students
are
not
allowed
to
listen
to
music
in
the
classroom.
School
rules
Don’t
fight
with
others.
=
Students
are
not
allowed
to
fight
with
others.
School
rules
=
Students
are
not
allowed
to
cheat.
Don’t
cheat.
School
rules
Don’t
wear
long
hair.
(boys)
=
Boys
are
not
allowed
to
wear
long
hair.
School
rules
=
Students
are
not
allowed
to
sleep
in
class.
Don’t
sleep
in
class.
Grammar
Focus
I
don’t
think
sixteen-year-olds
should
be
allowed
to
drive.
I
agree.
They
aren’t
serious
enough.
Do
you
think
teenagers
should
be
encouraged
to
make
their
own
decisions?
Teenagers
should
not
be
allowed
to
have
part-time
jobs.
No,
I
don’t
agree
with
this.
Teenagers
are
too
young
to
make
their
own
decisions.
I
disagree.
They
can
learn
a
lot
from
working.
If
you
don’t
use
a
flash,
then
it
may
be
OK.
Do
you
think
we
may
be
allowed
to
take
photos
if
we
don’t
use
a
flash?
一般现在时的被动语态
在英语中，动词有两种语态，即主动语态和被动语态。被动语态的基本结构是“助动词
be
+
及物动词的过去分词”，其中助动词be有人称、数和时态的变化,其变化规则与be作为连系动
完全一样。
1.一般现在时被动语态的各种句式结构
肯定式
主语+am/is/are+过去分词（
+
by…)
否定式
主语+am/is/are
+
not
+过去分词
(+by…)
疑问式
Am/Is/Are+主语+过去分词(+
by
…)?
特殊疑问词+
am/is/are+主语+过去分词（+
by
...)?
助记：
被动不离“be”
“p.p.”,
“p.p.”前面助动be。
主谓一致莫忘记，am,
is,
are现在时。
2.一般现在时被动语态的基本用法
用法
示例
表示经常性或习惯性发生的被动动作
I
am
often
asked
the
question
by
my
pupils.
表示近期正在发生的被动动作
These
days
people
are
moved
by
a
teacher
named
Zhang
Lili.
描述某种常态化的被动的客观事实
The
spaceship
is
mainly
controlled
by
computer.
强调目前存在的针对行为主体人的被
限制性动作
You
aren’t
allowed
to
take
photos.
3.主动语态变为被动语态的方法
第一步:将主动语态的宾语改为被动语态的主语；
第二步:将主动语态的谓语改为“be+及物动词的过去
分词”结构；
第三步:将主动语态的主语改为介词by的宾语，放在
谓语之后(有时可省略)。
如图示：
They
(主语）grow
(谓语）tea
(宾语）in
the
south-east
of
China.
被动语态:
主动语态:
Tea
(主语）is
grown
(谓语）by
them
in
the
south-east
of
China.
含有情态动词的被动语态
句式
结构
示例
肯定句
主语+情态动词+be+及物动词的过去分词(+by…)
Teenagers
should
be
allowed
to
go
shopping.
否定句
主语+情态动词+not+be+及物动词的过去分词(+by…)
The
word
can’t
be
used
in
this
sentence.
一般疑问句
情态动词+主语+be+及物动词的过去分词(+by…)?
Must
the
work
be
finished
today?
特殊疑问句
特殊疑问词+被动语态的一般疑问句？
Who
should
be
asked
for
help?
You
must
clean
your
bedroom
every
day.
Your
bedroom
must
be
cleaned
every
day.
2.
Parents
should
encourage
teenagers
to
do
social
work
for
their
community.
Teenagers____________________
______________________________________.
3.
Can
Lucy
do
her
homework
tomorrow
instead?
Can__________________________________________
should
be
encouraged
her
homework
be
done
tomorrow
instead?
4a
Rewrite
the
sentences
according
to
the
example.
to
do
social
work
for
their
community.
4.
Do
you
think
we
must
keep
teenagers
away
from
the
Internet?
Do
you
think
teenagers_________________________
______________?
5.
Parents
should
give
teenagers
chances
to
make
their
own
decisions.
Teenagers_____________________________________
________.
must
be
kept
away
from
should
be
given
chances
to
make
their
own
decisions
the
Internet
4b
Fill
in
the
blanks
with
the
correct
forms
of
the
words
in
brackets.
Should
teenagers
___________(ask)
to
move
out
when
they
start
working?
In
many
Western
countries,
teenagers
________(allow)
to
move
out
at
eighteen.
Their
parents
believe
that
they
should
___________(educate)
to
take
care
of
themselves
from
a
young
age.
This
way,
when
they
_______(start)
working
theycan
manage
their
own
lives.
However,
in
most
Asiansocieties,
it
is
not
common
for
teenagers
to
be
asked
are
allowed
be
educated
start
_________(move)
out.
Chinese
parents
believe
that
it
is
better
for
children
to
live
with
parents
who
can
________(take)
care
of
them.
But
the
young
should
then
look
after
their
parents
as
they
get
older.
That
is
why
many
Chinese
adults
___________
(continue)
to
live
with
their
parents.
move
take
continue
A:
Members
should
be
allowed
to
use
dictionaries.
B:
Yes,
but
they
should
only
use
English-English
dictionaries.
4c
Pairwork
You
and
your
friend
are
starting
an
English
club.
Make
a
list
of
rules
about
what
should
and
should
not
be
allowed.
总结
1．含有情态动词的被动语态的常见句式：
(1)肯定句结构为：主语＋情态动词＋be＋及物动词的过去分词(＋by＋宾语)．如：
Your
homework
should
be
finished
by
yourself.
你应该自己完成作业。
(2)否定句结构为：主语＋情态动词＋not＋be＋及物动词的过去分词(＋by＋宾语)．如：
The
book
can't
be
taken
out
of
the
reading
room.
这本书不能被拿出阅览室。
(3)一般疑问句结构为：情态动词＋主语＋be＋及物动词的过去分词(＋by＋宾语)?
回答：Yes，主语＋情态动词．/
No，主语＋情态动词＋not.如：
—Should
these
young
trees
be
watered
every
day？
应该每天给这些小树浇水吗？
—Yes，they
should./
No，they
shouldn't.对，应该。/不，不应该。
(4)特殊疑问句结构为：疑问词＋一般疑问句？如：
What
should
students
be
allowed
to
do？应该允许学生们做什么？
一、用括号内所给单词的适当形式填空。
1．More
trees
should
_________(plant)
this
year.
2．Must
the
work
_________(finish)
by
6：30
this
afternoon?
3．Where
can
the
lost
boy
____________(find)?
4．Thanks
to
the
Internet，different
kinds
of
information
can
_______________(learn)
in
a
short
time.
5．The
water
should
__________________(not
put)
here.
6．The
bad
food
shouldn't
be
__________(eat)．
7．The
stars
can
______________(not
see)
in
the
daytime.
8．Can
this
kind
of
bike
__________(buy)
in
that
shop?
9．The
fruit
should
_________________(keep)
well
during
winter.
be
planted
be
finished
be
found
be
learned
not
be
put
eaten
not
be
seen
be
bought
be
kept
二、按要求完成下列句子，每空一词。
1．Nobody
can
answer
the
question.(改为被动语态)
2．We
should
clean
our
teeth
twice
a
day.(改为被动语态)
3．Can
you
take
good
care
of
the
children？(改为被动语态)
4．The
classroom
must
be
cleaned
after
school．(画线部分提问)
5．We
must
wash
our
hands
before
meals.(改为被动语态)
The
question
can't
be
answered
by
anybody.
Our
teeth
should
be
cleaned
twice
a
day.
Can
the
children
be
taken
good
care
of
by
you?
When
must
the
classroom
be
cleaned?
Our
hands
must
be
washed
before
meals.