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theory可数，同一意思下

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theory可数吗？

theory可数，同一意思下

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是可数名词 ， 把y变i加es ， 即theories 。可数名词是指能以数目来计算 ， 可以分成个体的人或东西；因此它有复数形式 ， 当它的复数形式在句子中作主语时 ， 句子的谓语也应用复数形式 。
众数 ， 或称复数 ， 在语言学中是词素的其中一种 ， 常和单数相对 ， 在没有双数概念的语言中用于标示多于一个的物件 ， 在有双数概念的语言中则表示多于两个的名词数量 。在另外某些语言当中 ， 用于标示非一个物件 ， 包括多于一个物件和没有 。在许多的语言里 ， 多数的名词都有众数 ， 而另一部份的语言则缺乏 ， 或通常不使用众数 ， 如汉语、日语、越南语等 。
同一意思下名词性从句是在句子中起名词作用的主谓结构 ， 它可以在主从复合句中作主语、宾语、
表语、介词的宾语以及同位语 。
1.
主语从句
主语从句可以由连词that,
wh-疑问词或名词性关系词引导 。
⑴由连词that引导：从句可以位于句首 ， 但常常用形式主语it替代 ， 从句本身则放在
主句后面 ， 如：
that
he
will
come
to
the
party
is
certain.
it
happened
that
the
harvest
was
bad
that
year.
is
it
true
that
she
has
never
been
there?
通常在口语或非正式文体中 ， that常可省略 ， 但必须是在用先行词it的情况下 ， 如：
it’s
a
pity
(that)
you
are
leaving.
⑵由wh-疑问词引导：从句既可以前置 ， 又可以借助于先行词it后置 。如：
who
cleaned
the
meeting
room
is
unknown.
it’s
still
a
question
when
we
shall
have
our
sports
meet.
it
is
uncertain
whether
he
will
come.
注意：在疑问句中 ， wh-疑问词所引导的从句不能位于句首 ， 如：
is
it
known
where
she
went?
⑶主语从句也可由名词性关系词引导 ， 这类从句只能位于句首 ， 如：
where
she
went
was
los
angeles.
what
will
be,
will
be.
whomever
you
invite
will
be
welcome.
2.
宾语从句
⑴宾语从句可用that引导 ， 这时that仅起连接作用 ， 不充当从句中的成分 。如果连接词
要在从句中起语法作用 ， 就要使用连接词what等来引导从句 。
i
believe
that
he
is
honest.
we
fully
understood
what
he
meant.
⑵有些形容词的后面也可跟宾语从句 。这类形容词有：certain,
afraid,
aware,
sorry,
sure,
worried等 。如：
i’m
afraid
that
you
are
wrong
on
this
point.
i
am
aware
that
you
have
been
exceptionally
kind
to
me.
⑶宾语从句也可以用how,
when,
who,
which,
where,
why等词引出 ， 此时即使主句是一
个疑问句 ， 宾语从句也必须保持陈述句的语序 。如：
go
and
ask
why
he
was
late
yesterday.
can
you
tell
me
where
the
hospital
is?
⑷跟在介词后面的宾语从句一般不能由that来引出 ， 只限于except,
in,
but,
besides,
save
等五个介词的宾语从句 ， 其它介词后面不能跟由that引出的宾语从句 ， 而只能跟由what,
how,
whether等引出的宾语从句 。
you
are
wrong
in
that
you
took
effect
for
cause.
i
would
go
with
you,
except
that
i
have
to
work
that
day.
they
were
arguing
about
what
was
to
be
done.
i’m
thinking
of
whom
i
should
ask
for
help.
3.
表语从句
表语从句通常由that引出 ， 当然how,
why,
where,
when等也可以引出表语从句 。常见的
表语从句有下面两种句型：
⑴"the
reason…that"：表示“原因是……” 。如：
the
reason
for
leaving
was
that
it
was
too
cold.
⑵"it
(this,
that)
is
because…"：表示“这是因为……” ， “这是由于……缘故” 。如：
this
is
because
iron
contains
more
carbon
than
steel.
4.
同位语从句
同位语从句表示与之同位的名词中心词的实际内容 。
⑴同位语从句起进一步解释说明先行词的作用 ， 通常由that引导 。同位语从句的先行词
通常是一些抽象名词 ， 如：appeal,
idea,
truth,
fact,
theory,
belief,
plan,
hope,
proposal,
rumor,
suggestion等 。
there
is
truth
in
the
old
saying
that
necessity
is
the
mother
of
invention.
⑵由wh-疑问词引导 ， 如：
i
have
no
idea
when
he
will
come.
it
is
difficult
to
answer
your
question
why
i
did
it.
⑶由名词性关系词引导 ， 如：
fame
and
fortune—what
others
sought
after
with
zest—was
all
rubbish
to
him.
⑷注意同位语和that引导的定语从句的区别：that在同位语从句中只起引导从句的作用 ， 
本身并无意义 ， 也不在句子中担当任何成分；而定语从句的that既引导从句又充当句子成分 。
the
news
that
he
intended
to
【theory可数，同一意思下】come
gave
us
much
pleasure.（同位语从句 ， that不作句子成
分 。）
he
is
the
best
speaker
that
addressed
the
meeting.（定语从句 ， that在从句中作宾语 ， 指代
的先行词是主句中的主语 。）

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