名詞性從句講解
I．語序問題
規律一：名詞性從句在句中要用陳述語序

II．引導詞的選擇
1.從句是陳述句轉化而來的，不含有疑問意義。由that
引導且that連詞在從句中不作成分
2.從句是由一般疑問句轉化而來，含有疑問意義的。由whether，if 引導
3.從句是由特殊疑問句轉化而來，含有疑問意義的。由wh-連詞引導且 wh-
連詞在從句中作成分。連接代詞what / who/ which / whose / whatever / whoever
/ whomever / whichever，連接副詞where / when / why / how / wherever /
whenever。

規律二： whether和if的區別
①whether和if在賓語從句中可以互換，但是作介詞賓語時連接詞一般用whether。如：
It all depends on whether they will come back.
②后面直接跟or not 時用 whether。如：
I didn’t know whether or not he had arrived in Wuhan
③主語從句和表語從句中只能用whether。如：
Whether the meeting will be put off has not been decided yet.
The question is whether they have so much money.
④whether可以引導同位語從句，用以說明前面的名詞的內容，if不能。如：
We ought to discuss carefully the question whether we can do it or not.
⑤whether常與or連用表示一種選擇，if不能這樣用；whether也可與動詞不定式連用但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.
⑥
whether可引導一個讓步狀語從句表示“不管”、“無論”，而if不能，但可以引導一個條件
狀語從句表示“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

規律三：主語從句和賓語從句在適當的情況下可以借助 “it” 而后置。
1.主語從句可以用it （作形式主語） 來替換成以下幾種結構表達。
(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.賓語從句可以用it（作形式賓語） 來替換的句型為：
主語＋謂語＋it＋Adj/N＋從句如：
I think it necessary that we have the meeting．

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

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