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宾语从句中的引导词怎么确定
宾语从句当然有引导词,一般是三种：
1）如果宾语从句不缺少任何成分,则引导词为that,不过that有时经常可以省略.
如：I
don't
know
(that)
he
is
a
teacher.
2）如果宾语从句缺少“是否”的疑问词,则引导词为if/whether.不过用whether最好,有时候if是不能使用的.
如：I
want
to
know
if/whether
you
are
good
at
English.
3）如果宾语从句缺少其他成分,则引导词为相应的可以补充句子完整的疑问词,一般分为疑问代词who/whom/what/which/whose或疑问副词when/where/why/how等.
如：Can
you
tell
me
how
I
can
get
to
the
bus
station?
I
don't
know
who
you
are
looking
for.
另注意：
引导词只能用其中之一,不能重复使用；
引导词后面的从句句序必须是陈述句句序,而不能用倒装句序.
英语宾语从句 引导词的选择
宾语从句的引导词通常分为三种：
1
当宾语从句为陈述句时，用that;
2
当宾语从句为一般疑问句时，用if或者whether;
3
当宾语从句为特殊疑问句时，用构成特殊疑问句的疑问词，即：what,
which,
how,
where.....
宾语从句的引导词怎么选
if和whether的选择要注意
有or not的话用whether
discuss用 whether
介词后用whether
句首用whether(记得好象有那么一条?)
特殊疑问词引导的宾语从句,要点是疑问词在从句中担当相应成分(而在主句中担任的当然就是宾语了)
如 I wonder _____ opened the door.
从句缺主语，填上担当主语的疑问代词who （人）
He asks me ______ we live.
从句live缺地点状语, 填疑问副词where (adv. 包括live in 的介词in,无须再加
He asks me ______ I was born.
还是缺状语....时间状语对应填when 也行,地点状语对应填where也行...
....
定语从句中的关系代词
宾语从句中引导词的用法如下：
在复合句中作主句的宾语，引导词有：
连词：that (that 常可省略),whether, if
代词：who, whose, what ,which
副词：when ,where, how, why 等。
(一)that引导的宾语从句(在非正式场合that可以省略)
可跟that从句做宾语的动词有：
say, think, insist, wish, hope, demand, imagine, wonder, know, suppose, see, believe, agree, admit, deny, expect, explain, order, command, feel, dream, suggest, hear, mean, notice, prefer, request, require, propose, declare, report等。
例句：The boy believes that he will travel through space to other planets.
注意事项：当主句谓语动词是 think, believe, suppose, expect 等词，而宾语从句的意思是否定时，常把否定转移至主句表示。
例句：I don’t think it is right for him to treat you like that.
在以下情况中that不能省略
1、当句中的动词后接多于两个由that引导的宾语从句时，第一个that可省，但后面的that不可省。
例句：He said (that) you were too young to understand the matter and that he was asked not to tell you.
2、当主句的谓语动词与that宾语从句之间有插入语时，that一般不可省。
例句：Just then I noticed, for the first time, that our master was wearing his fine green coat and his black silk cap.
3、当that从句是双宾语中的直接宾语时，that不可省。
例句：I can’t tell him that his mother died.
注意事项：许多带复合宾语的句子，that引导的宾语从句经常移到句子后部，而用it作形式宾语。
例句：I find it necessary that we should do the homework on time.
(二)由whether,if 引导的宾语从句
由whether(if)引导的宾语从句，实际上是一般疑问句演变而来的。意思是“是否”。宾语从句要用陈述句语序。一般说来，在宾语从句中whether与if可以互换使用，但在特殊情况下if与whether是不能互换的。
例句：I wonder whether(if) they will come to our party.
只能用whether，不能用if引导的宾语从句
1、在带to的不定式前
例句：We decided whether to walk there.
2、在介词的后面
例句：I’m thinking of whether we should go to see the film.
3、在动词后面的宾语从句时
例句：We discussed whether we had a sports meeting next week
4、直接与or not连用时
例句：I can’t say whether or not thet can come on time.
只能用if不能用whether引导的宾语从句
1、if引导条件状语从句，意为“如果”
例句：The students will go on a picnic if it is sunny.
2、if引导否定概念的宾语从句时
例句：He asked if I didn’t come to school yesterday.
3、引导状语从句even if(即使)和as if(好象)时
例句：He talks as if he has known all about it.
(三)连接代词和连接副词引导的宾语从句
这样的宾语从句实际上是由特殊疑问句变化而来的，宾语从句要用陈述句语序。用于这种结构的动词常常是：see, say, tell, ask, answer, know, decide, show, find out, imagine, suggest, doubt, wonder, discover, understand, inform, advise等。
英语中的连接代词有：who,whom,whose,which,what,在句中担任主语、宾语、定语或者表语。
例句：Can you tell me whom you are waiting for?
英语中的连接副词有：when,where,why,how，在句中担任状语的成分。
例句：None of us knows where these new parts can be bought.
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