名词性从句是大家英语学习过程中非常重要的一个句型，名词性从句，包括主语从句，表语从句，表宾语从句以及同位语从句4种句型，所以有很多的注意点。那么学习名词性从句需要注意的事项有哪些呢？接下来小编就和大家分享一些关于这方面的内容，一起来看看吧。
学习名词性从句需要注意的事项
词序问题
名词性从句总是用陈述句词序，则不能使用疑问句词序，尤其是当名词性从句由“疑问词”引导时，不能受疑问句的影响而误用疑问句词序：
误：I didn‘t know where did he live.
正：I didn’t know where he lived. 我不知道他住哪儿。
误：Who will he marry remains unknown.
正：Who he will marry remains unknown. 他同谁结婚还不知道。
时态问题
由于由when引导的时间状语从句和以if引导的条件状语从句要用现在时表示将来意义，而不能直接使用将来时态，所以许多同学容易受此影响在when和if引导名词性从句时也用现在时表示将来意义。
主语从句（Subject Clause）
用作主语的从句叫主语从句。引导主语从句的关联词有从属连词、疑问代词、疑问副词、缩合连接代词、缩合连接副词等。
表语从句（Predicative Clause）
用作表语的从句叫做表语从句。引导表语从句的关联词与引导主语从句的关联词很多都一样。
宾语从句（Object Clause）
在句子中起宾语作用的从句叫做宾语从句.宾语从句分为三类：动词的宾语从句、介词的宾语从句和形容词的宾语从句。
同位语从句
是名词性从句(主语从句、表语从句、宾语从句、同位语从句)中的主要从句之一，从句作同位语表示与之同位的名词(短语)的实际内容，它的作用相当于名词，对前面的名词(短语)加以补充说明或进一步解释，相当于一个表语从句，它们之间的关系就是同位关系，即主表关系。
英语语法学习技巧有哪些
积极主动归纳总结语法规则
英语学习者在学习过程中要善于主动观察、归纳、总结语法规则，不要完全依靠教师或书本的讲解。研究表明，学习者自己归纳总结的语法规则比从书本上学来的记得更好。例如动词不定式和动词-ing形式都可作宾语，归纳后可知高中有少数动词后只能跟动词-ing形式作宾语，它们主要是mind, miss, enjoy, admit, avoid, finish, escape, practice等。
要善于从错误中学习
学习者要善于从错误中学习。英语学习中出现错误是不可避免的。学习者一方面不要怕犯错误，应大胆地使用英语;另一方面，要注意纠正错误，从错误中学习。对于教师批改过的作业，一定要仔细看。在口头交际中，不能完全不顾语法，但也不能因为怕犯语法错误而不敢开口。研究表明，在口头表达中，适度地监控语法的正确性和准确性最有利于提高口语能力
不要被语法术语困扰
在语法学习中，学习者经常被某些语法术语所困扰。不同的语法书和不同的语法学家经常使用不同的语法术语，这给英语学习者造成不少困难。学习者如果遇到难以理解的语法术语，最好是请教老师，看有没有其他解释。比如有的语法书里使用“名词性从句”、“形容词性从句”等概念。有的学习者难以理解。其实，名词性从句包括主语从句、宾语从句等;形容词性从句一般指定语从句。
以上就是小编为大家整理的关于学习名词性从句需要注意的事项，希望可以给大家带来帮助。在名词性从句学习过程中，大家首先要掌握它包括哪几种句型，它的概念是什么以及它的语序是什么，相信通过大家的努力，一定可以掌握好名词性从句。
名词从句要注意两点：
1. 连词：that，whether / if ， what , where , when 等等；
2. 语序：比如说I know where you live.，不要看到where就用疑问句的语序，而应该用陈述句语序。
名词性从句的前后时态一致！！
名词性从句共有四种:主语从句,表语从句,宾语从句和同位语从句
1． 主语从句：主语从句在整个句子中作主语。
(1)不同于其它的连词，它不充当句子的成分，只是单纯的连接词，通常不可以省略。分句置于句首时，that绝对不可以省略。
That the driver could not control his war was obvious.
It was obvious that the driver could not control his car.
(2)if 不能用在主语从句中，而是用whether
Whether he left (or not) is unknown
(3)当主语从句作主语时，谓语动词一般用第三人称单数，下面这个句型例外。
What we need is more time and money.
What we need are many more books.
2.表语从句：表语从句出现在系动词后，充当表语。
The trouble is that we are short of money.
Go and get your coat. It’s where you left it.
(1) 引导表语从句除了上述三类词外还有because, as if/ as though等等
The reason (why/for which…..) is that ……
It/This/That is because……
(2) 连系动词“appear, look, seem”的两个常用句型
It seems/appears that….
It looks/seems as if/as though……(与事实相符用陈述语气，与事实相反用虚拟语气)
(3) as 也可以引导表语从句
Things are not always as they seem to be
3. 宾语从句：及物动词，形容词和介词后加宾语从句作其宾语。
(1) 宾语从句时态与主句相呼应，但宾语从句表示的是客观真理或普遍现象除外
The teacher told us that the earth moves around the sun
(2) 连词whether和 if可以互换，但注意下列情况
连词后紧跟or not时用whether
I want to know whether or not they will come.
作介词宾语是用whether引导宾语从句
He was interested in whether he saw her there.
连接词后直接加不定式，不能用if只能用whether
He doesn’t know whether to stay or not.
如果宾语从句是否定时，一般用if引导
I care if he will not attend the meeting.
(3) 当宾语从句后带宾补时，要用“主语+谓语+it +宾补+that-clause,that不可省略
I think it certain that she will do well in her exam.
(4) 当主语是I, we ，主句用think, believe, suppose, expect, imagine五个动词时，用否定转移
I don’t think he will win the game, will he?
(5) that在宾语从句常可以省略，但由and或 but连接两个或多个宾语从句时，仅可以省略第一个连词that
He said (that) he had eaten nothing but that he wasn’t hungry.
(6) 注意区别if引导的宾语从句和条件状语从句
I don’t know if he will come.
If he comes, I’ll let you know.
4.同位语从句，在句中作某些名词的同位语，对前面的名词进一步说明。用在下列名词 fact,news,idea,hope,believe,hope,thought,doubt.truth,order,suggestion, word etc.
(1) There is no doubt that he will come.
There is doubt whether he will come.
Word came that Napoleon would come to inspect them.
There is no possibility that….
(2) that引导的同位语从句与定语从句的区别：
在同位语从句中：that不可以省略，不作成分定语从句的关系代词that在定语从句作成分，作宾语时可以省略
We are interested in the news that some foreigners would visit our school.
We are interested in the news that he told us.
when, where引导的同位语从句与定语从句的区别：
在定语从句中，when, where前有分别表示时间、地点的先行词；而在同位语从句中无此对应关系
They have no idea at all where he has gone.(同位语从句)
Go and get your coat. It’s in the place where you left it.(定语从句)
5. 疑问词-ever既可以引导名词性从句，也可以引导让步状语从句，而no matter+疑问词只能引导让步状语从句
No matter where I go, my heart is towards China.
I believer whatever he says. Whatever he says, I will never believe him.
who与 whoever的区别
who是“谁”的意思，表示具有疑问，who相当于anyone who“无论谁”
Whoever leaves the room last ought to turn off the lights.
Can you tell me who that gentleman is?
6．当名词性从句缺少主语、宾语或表语时，引导词通常用what，它相当于。另外，有时具有感叹意义all that, anything that或 the thing(s) that
What we can’t get seems better than what we have.
Tom thought what a beautiful girl Mary was.
7.注意区分it 作形式主语的主语从句与强调句
强调句句型It is/was+被强调部分+that, 去掉It is/was, that，句子仍然成立。
It is natural that they should have different views. 主语从句
It is only lately that he had had a family himself. 强调句
What was it that he wanted? I don’t know what it was that he wanted.
It was in the hotel where he stayed that we discussed the serious problem
8.注意it 作形式主语的主语从句和as引导非限制性定语从句引导的不同
It is known to all that the earth is round.
As is known to all. the earth is round.
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
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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