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高考英语语法讲解之名词性从句

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名词性从句讲解
I.语序问题
规律一:名词性从句在句中要用陈述语序

II.引导词的选择
1.从句是陈述句转化而来的,不含有疑问意义。由that
引导且that连词在从句中不作成分
2.从句是由一般疑问句转化而来,含有疑问意义的。由whether,if 引导
3.从句是由特殊疑问句转化而来,含有疑问意义的。由wh-连词引导且 wh-
连词在从句中作成分。连接代词what / who/ which / whose / whatever / whoever
/ whomever / whichever,连接副词where / when / why / how / wherever /
whenever。

规律二: whether和if的区别
①whether和if在宾语从句中可以互换,但是作介词宾语时连接词一般用whether。如:
It all depends on whether they will come back.
②后面直接跟or not 时用 whether。如:
I didn’t know whether or not he had arrived in Wuhan
③主语从句和表语从句中只能用whether。如:
Whether the meeting will be put off has not been decided yet.
The question is whether they have so much money.
④whether可以引导同位语从句,用以说明前面的名词的内容,if不能。如:
We ought to discuss carefully the question whether we can do it or not.
⑤whether常与or连用表示一种选择,if不能这样用;whether也可与动词不定式连用但i
f不能。如:
The question of whether they are male or female is not important.
I have not decided whether to go or not.

whether可引导一个让步状语从句表示“不管”、“无论”,而if不能,但可以引导一个条件
状语从句表示“如果”如:
Whether he comes or not, we will begin our party on time.
If I have time tomorrow, I’ll go to visit Tom

规律三:主语从句和宾语从句在适当的情况下可以借助 “it” 而后置。
1.主语从句可以用it (作形式主语) 来替换成以下几种结构表达。
(A)It is clear/certain/likely
/true/surprising that…
(B)It is a pity/shame
/good idea/no wonder that ...
(C)It is said/reported/ believed/known/thought
/suggested that …
(D)It seems/happens that…
2.宾语从句可以用it(作形式宾语) 来替换的句型为:
主语+谓语+it+Adj/N+从句如:
I think it necessary that we have the meeting.

规律四:whatever, whichever, whoever, whenever, wherever, however 等与
no matter what, no matter which, no matter who, no matter when, no matter
where, no

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重点单词   查看全部解释    
certain ['sə:tn]

想一想再看

adj. 确定的,必然的,特定的
pron.

 
pity ['piti]

想一想再看

n. 同情,怜悯,遗憾,可惜
v. 同情,怜悯

 


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