中小学教育资源及组卷应用平台
牛津深圳（广州）版八年级下册
Unit7
The
unknown
world语法：原因状语从句
知识点详解
定义：
原因状语从句是指在复合句中表示主句动作发生原因的句子。原因状语从句可置于句首，也可置于句尾。用于引导原因状语从句最常用的连词是because，另外还有as,
since等。
【例】
He
didn’t
come
to
school
because
he
was
ill.
As
it
is
raining,
we
shall
not
(不得；不应该)go
the
zoo.
Since
you
can’t
answer
the
question,
I’ll
ask
someone
else.
用法：
1.Because
表示直接原因，语气最强。它所指的原因通常是听话人所不知道的。Because引导的原因状语从句多放在主句之后。
(1)回答由why提出的问题，只能用because而不能用since，as。
【例】------Why
aren’t
going
there?
------Because
I
don’t
want
to.
(2)because不能与并列连词so同时在句中使用。
【误】Because
he
was
careless,
so
he
failed
in
the
exam.
【正】Because
he
was
careless,
he
failed
in
the
exam.由于他粗心，所以他考试不及格。
【正】He
was
careless,
so
he
failed
in
the
exam.由于他粗心，所以他考试不及格。
(3)because和because
of
也有明显的区别。because后面要跟从句，而because
of
后面要跟
名词短语。
【例】I
didn't
buy
it
because
it
was
too
expensive.
He
is
here
because
of
you
(that).
He
lost
his
job
because
of
his
age.
We
said
nothing
about
it,
because
of
his
wife’s
being
there.
He
knew
she
was
crying
because
of
what
he
had
said.
【即学即练】
1.判断正误
误：He
didn't
come
because
of
he
was
ill.
误：He
didn't
come
because
of
that
he
was
ill.
正：He
didn't
come
because
he
was
ill.
正：He
didn't
come
because
of
his
illness.
2.用because、because
of
填空。
1）He
is
late
for
school
___
it
rains
heavily.
2）He
is
late
for
school
the
heavy
rain.
Since
意思是“既然,由于,因为”,
语气比because?稍弱，表示已知的、显然的理由,较正式,多位于句首。since引导的从句是次要的，重点强调主句的内容。?
【例】
Since
tomorrow
is
LI
Hong's
birthday,
let’s
give
him
party.
Since
everyone
is
here,
let’s
start
our
class.
Since
you
are
free,
you'd
better
tidy
your
bedroom.
Since
it
is
late,
I
shall
go
home
right
now.
as
它表示的是双方已知的事实或者显而易见的原因。含义与since相同，但语气更弱，没有since正式，常翻译为“由于、鉴于”，从句说明原因，主句说明结果，主从并重。?
【例】
As
you
were
not
there,
I
left
a
message.
We
have
to
delay
our
journey,
as
the
weather
is
so
bad.
As
rain
has
fallen,
the
air
is
cooler.
As
Monday
is
a
national
holiday,
all
government
offices
will
be
closed.
【即学即练】
用because、as、since
填空。
1.
I
didn’t
go
to
school
yesterday
_________
I
was
ill.
2.
________
everybody
is
here,
let’s
begin
our
meeting.
3.
________
you
are
in
poor
health,
you
should
not
stay
up
late.
4.
I
asked
her
to
stay
to
tea,
________
I
had
something
to
tell
her.
5.
________
all
the
passengers
are
here,
why
don’t
we
start
at
once?
6.
Bill
won’t
make
any
progress
________
he
doesn’t
study
harder
than
before.
7.
He
might
have
gone
to
bed,
________
the
light
went
out.
8.
___________
you
do
not
understand,
I
will
explain
again.
9.
___________
Jane
was
the
oldest
in
this
family,
she
had
to
look
after
the
others.
10.
He
must
be
ill,
____________
he
is
absent
today.
11.
The
teacher
must
be
strict
with
you
__________they
want
you
to
make
great
progress.
12.
___________your
father
is
well
again,
you
no
longer
have
anything
to
worry
about.
13.
The
day
breaks,
__________the
birds
are
singing.
14.
___________
you
are
ill,
you’d
better
go
to
see
the
doctor.
15.
__________
she
was
late
for
class,
she
had
to
say
sorry.
答案：1.
because
2.
Since/As
3.
As/Since
4.
because
5.
Since/As
6.
because
7.
for
8.
Since/As
9.
As/Since
10.
for
11.
because
12.
Since/As
13.
for
14.
Since/As
15.
As/Since
★培优附加拓展讲解：
易考原因状语从句连词还有以下几个：
1.
for
并列连词for，放在主句之后，并通常以逗号将其引导的从句与主句分开，它不能直接说明原因，引导后半句对某种情况进行推测来作为补充说明的理由，语气较because,
since,
now
that弱，但较as要强。
We
listened
carefully,
for
the
speech
was
very
important.我们认真听讲因为这个演讲很重要。
The
day
gets
long,
for
it
is
summer
now.白天变长因为现在是夏天了。
It
rained
last
night,
for
the
ground
is
wet
this
morning.昨晚下雨了，因为今天早上地都湿了。
Tom
must
be
ill,
for
he
is
not
in
the
office
today.
汤姆肯定病了，因为他今天不在办公室。
相比较而言：
as和for引导的主、从句，二者处于平等位置；
because引导的从句显得比主句重要，强调原因；
since引导的从句显得次要，而主句重要，以说明将要做什么事。
2.
now(that)
now(that)主要用于口语,表示微弱的原因,主从句因果关系不明显,常译为“既然”。
I’m
going
to
relax
now
(that
)
the
school
year
is
over.
这一学年结東了、所以我打算放松ー一下。
Now
(that)
you
have
come,
you
may
as
well
stay.
既然你已经来了,那就留下来吧。
Now
that
she
understood,
her
anger
faded
away.
既然她明白了，她的怒气就消了。
Now
that
they've
got
to
know
each
other
a
little
better,
they
get
along
just
fine.
由于彼此间有了进一步的了解，他们相处的不错。
Now
that
a
tunnel
has
been
built
through
the
mountains，the
pass
is
less
dangerous.
由于一条穿山隧道已经开通，翻越山口已不那么危险了。
He
soon
discovered
how
much
faster
he
could
travel
now
that
he
was
alone.
由于是只身一人，他很快便发现他可以比先前走得快得多。
3.
in
that
用于说明为什么主句所表达的陈述是确实的
I'm
in
a
difficult
situation
in
that
I
have
been
offered
two
jobs
and
they
both
sound
interesting.
我之所以为难，是因为我有两份工作可选择，并且它们看上去都还不错。
He
failed
to
arrive
at
the
airport
punctually
in
that
he
had
suffered
a
terrible
traffic
jam.他之所以没能准时到达机场是因为他遇到了严重的塞车。
I
like
the
city,
but
I
prefer
the
country
in
that
there
is
fresher
air.
我喜欢城市，但我更喜欢乡村，因为那里有更清新的空气。
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牛津深圳（广州）版八年级下册
Unit7
The
unknown
world语法：原因状语从句
(含答案)
一、改写句子，保持句意不变。
1)
The
ship
changed
its
course
because
there
was
a
storm.
The
ship
changed
its
course
_______
_______
_______
_______.
2）Math
is
very
difficult,
so
Gina
doesn’t
like
it.（改为同义句）
Gina
_________
like
math
_________
it’s
very
difficult.
3)
He
couldn’t
walk
because
his
leg
was
broken.
He
couldn’t
walk
______
______
his
______
leg.
4)
I
came
back
because
it
was
raining
heavily.
I
came
back
______
______
the
______
rain.
5)
It
was
cold,
so
I
closed
the
window
and
door.（合并为一句）
I
closed
the
window
and
door
________
it
was
cold.
二、完成句子。
1.
她不开心是因为她上学迟到了。
She
was
unhappy
__________
she
was
late
__________
school.
2.
我不喜欢地理，因为它有点儿难。
I
__________________
geography
_______
it’s
__________________________.
3.
既然汽车坏了，就什么都做不了了。
_____the
car
broke
down,
nothing_____________.
4..
由于虚拟现实科技，人们不必亲临其境即可游览国内外名胜。
____________of
VR
technology,
people
can
____________
places
of
interest
both
at
home
and
abroad
instead
of
going
there
in
person.
5.
他们不能乘船过去，因为河流太急。
They
can’t
go
________
boat,
because
the
river
_______
too
_________.
三、根据句子或对话内容，选用because,
as,
since或
because
of
填空。
1.
Mary
didn’t
go
to
school
yesterday___________
she
was
ill.
2.
___________
everybody
is
here，let’s
begin
our
games.
3.
___________
you
are
in
poor
health,
you
should
go
to
bed
earlier.
4.
She
didn’t
come,
___________
she
was
busy.
5.
___________
all
the
passengers
are
here,
why
don’t
we
start
at
once?
6.
Bill
won’t
make
any
progress
he
doesn’t
study
harder
than
before.
7.1
couldn’t
sleep___________
the
noise.
8.
Li
Ming
didn’t
go
out
for
a
walk___________
the
heavy
rain.
9.1
was
absent
from
the
meeting___________
my
illness.
10.—Why
did
you
buy
a
scarf
yesterday?
—___________
it
was
my
mum’s
birthday
yesterday
and
I
bought
it
as
a
gift
for
her.
四、选择题。
1.
________
I'd
like
to
join
the
Music
Club
________
I
can
sing.
A.
Because;
because
of
B.
So;
because
C.
/;
because
of
D.
/;
because
2.
—
Why
isn’t
he
hungry
now?
—
________
he
has
had
a
lot
of
bread.
A.
Because
of
B.
Because
C.
So
D.
So
that
3.
I
can't
tell
whether
she
is
old
or
young,
________
I
have
never
seen
her.
A.
but
B.
for
C.
or
D.
so
4.
________
you
know
it
is
harmful,
you
should
stop
reading
in
such
a
dark
place.
A.
Until
B.
Unless
C.
Although
D.
Since
5.
They
waited
________
it
was
dark
before
leaving,
________
they
didn’t
want
anyone
to
see
them
leave.
A.
since;
because
B.
until;
as
C.
unless;
for
D.
so;
because
6.
We
should
care
more
about
our
health
________
good
health
is
the
first
step
towards
success.
A.
so
B.
because
C.
but
D.
if
7.
_________
it
was
raining,
_________
we
stayed
at
home.
A.
Because,
so
B.
Because,
/
C.
Because,
for
D.
If,
so
8.
________
you
have
come,
let
me
show
you
around
our
school.
A.
Although
B.
Because
C.
Since
D.
So
that
9.
_______
you’ve
got
a
chance,
you
might
make
full
use
of
it.
A.
Now
that
B.
After
C.
Although
D.
As
soon
as
10.
—Why
was
he
late,
Tom?
—He
was
late
________
his
clock
didn't
work,
not
________
the
bad
weather.
A.
because;
because
of
B.
because
of;
because
C.
because;
because
D.
because
of;
because
of
11.
—Why
didn't
he
stop
to
have
a
rest?
—________
he
had
to
complete
his
work
on
time.
A.
Because
B.
If
C.
As
D.
Since
12.
My
dream
is
______
a
football
player
______
I
like
football
best.
A.
be,
because
B.
to
be,
but
C.
to
be,
because
D.
be,
and
13.
we
know
it's
not
safe
to
go
outside
now,
we'd
better
stay
at
home
as
often
as
possible.
A.
Unless
B.
Since
C.
Before
14.
—Did
you
have
a
sports
meeting
yesterday?
—No，we
didn't.
It
was
put
off
(??)
the
heavy
rain.
A.
instead
of
B.
because
of
C.
as
for
D.
as
15.
Tina
woke
up
at
midnight
________
a
loud
noise.
A.
because
B.
because
of
C.
as
D.
since
五、课后巩固（家庭作业）
（1）用
because,
because
of,
as
或
since
完成对话。
Rob:
Have
any
aliens
ever
visited
the
earth?
Nancy:
I
believe
the
aliens
have
visited
the
Earth
(1)
___________
some
people
have
met
aliens.
Jimmy:
Why
do
you
believe
that?
(2)
___________
we
know,
not
all
stories
about
aliens
are
true—
many
are
hoaxes
(骗局，谣言).
Nancy:
I
do
believe
it
is
true
(3)
___________
the
evidence
(证据）that
people
provide
just
like
the
UFO.
Rob:
Well,
I
believe
aliens
haven’t
visited
the
Earth.
Nancy:
What’s
your
reason?
Rob:
(4)
___________
you
want
to
know
the
reason,
let
me
tell
you
the
main
reason
for
it.
Some
of
the
evidence
of
aliens
is
not
real,
just
(5)
___________
people
like
imagining
things.
Jimmy:
I
agree
with
you.
（2）单项选择。
1.They'll
explore
the
forest
to
try
and
(??)
more
about
these
aliens.
A.
find
B.
look
for
C.
look
out
D.
find
out
2.
They
had
some
hair，(??)
they
didn't
have
any
feather.
A.
because
B.
and
C.
so
D.
but
3.
—I
will
go
to
the
party
alone
(??)
you
don't
want
to.
—Have
a
good
time.
A.
until
B.
since
C.
when
D.
as
4.
—Did
you
have
a
sports
meeting
yesterday?
—No，we
didn't.
It
was
put
off
(??)
the
heavy
rain.
A.
instead
of
B.
because
of
C.
as
for
D.
as
5.?I?will?call?you?as?soon?as?I?______?the?ticket?to?the?football?match.???
A.?will?get????B.?get?????C.?got??????D.?am?getting?
6.?Don’t?discuss?the?problems?with?your?partner?unless?you_______?any?more.????
A.?ask????B.?are?asked???C.?will?ask???D.?will?be?asked?
7.?________?he?was?very?ill,?he?still?went?on?working.?
A.?Because????B.?For??????C.?Though??????D.?/?
8.?________?it?is?getting?dark,?______?the?farmers?are?still?working?in?the?field.??
A.?Though,?but????B.?But,?though?????C.?Though,?/?????D.?But,?/?
9.?________?of?last?month?we?had?seen?five?English?films.?A.?By?the?end???B.?At?the?end?
????C.?In?the?end?????D.?To?the?end?
10.?Lucy?knew?nothing?about?it?________?her?sister?told?her.??A.?because?????B.?until??????C.?if??????D.?since
11.—Why
didn’t
you
email
me
to
tell
me
about
this,
Jack?
—______
I
was
too
sad
at
that
time.
A.
For
B.
As
C.
Since
D.
Because
12.---______
do
you
buy
so
many
film
tickets?
---
Because
all
the
members
of
the
Film
Club
are
going
to
the
cinema
together.
A.
Why
B.
What
C.
How
D.
Who
13.He
didn’t
go
to
work
_______
it
was
raining
______.
A.
because,
heavy
B.
because
of
,heavily
C.
because,
heavily
D.
because
of,
heavy
14.______everyone
is
here,
let’s
start
our
meeting.
A.
Because
B.Since
C.Though
D.
When
15._______
there
was
no
seat
to
sit
on
on
the
bus
yesterday,
he
had
to
stand
all
the
way.
A.
Because
of
B.
Though
C.
As
D.
Because
16.----
Could
you
tell
me
______
yesterday
?
----Because
my
bike
was
broken
on
the
way
home.
A.
why
you
came
late
B.
why
do
you
come
late
C.
why
did
you
come
late
D.
why
you
come
late
17.
Mr
Green,
our
English
teacher,
is
very
knowledgeable
_______
he
reads
lots
of
books.
A.
but
B.
so
C.
because
D.
although
18.
______
her
daughter
hadn’t
come
back,
______
she
looked
worried.
A.
Because,
/
B.
Because,
so
C.
Though,
but
D.
Though,
/
19._______
you’ve
got
a
chance,
you
might
make
full
use
of
it.
A.
Now
that
B.
After
C.
Although
D.
As
soon
as
20.
His
business
got
into
trouble
_______
competition
from
the
large
companies.
A.
because
B.
because
of
C.
instead
D.
instead
of
21.
________
you
have
finished
your
homework,
how
about
going
shipping?
A.
Since
B.
Before
C.
When
D.
Because
22.—We
all
like
Amy
_______
she
is
kind
and
helpful.
---Yes!
Without
her
help,
I
can’t
improve
my
spoken
English.
A.
so
B.
and
C.
but
D.
because
23.
_______everybody
understand
the
importance
of
it,
I
don’t
have
to
talk
about
it
any
more.
A.
Though
B.
Because
C.
So
D.
Since
24.
It
rained
last
night,
______
the
ground
is
wet
this
morning.
A.
because
B.
since
C.
for
D.
as
25.
_______
his
careless,
Jim
got
low
marks
in
this
English
exam.
A.
Because
B.
Since
C.
As
D.
Because
of
参考答案
一、改写句子，保持句意不变。
because
of
the
storm
2.
doesn’t
because
3.
because
of
broken
4.
because
of
heavy
5.
because
二、完成句子。
1.because
for
2.don’t
like
because
a
little
difficult
3.Since
could
be
done
4.Because
visit
5.by
runs
quickly
三、根据句子或对话内容，选用because,
as,
since或
because
of
填空。
1.
because
2.
Since
3.
As
4.
because
5.
Since
6.
because
7.
because
of
8.
because
of
9.
because
of
10.
Because
四、选择题。
1.D
2.B
3.B
4.D
5.B
6,B
7.B
8.C
9.A
10.A
11.A12.C
13.B
14.B
15.B
五、课后巩固（家庭作业）
（1）用
because,
because
of,
as
或
since
完成对话。
1.
because
2.
As
3.
because
of
4.
Since
5.
because
（2）单项选择。
1-5
DDBBB
6-10BCCBB
11-15:
DACBC
16-20:
ACAAB
21-25.
ADDCD
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