17.3 名詞性wh-從句
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1)由wh-詞引導的名詞從句叫做名詞性wh-從句。Wh-詞包括who, whom,. whose, whoever, what, whatever, which, whichever等連接代詞和where, when, how, why等連接副詞。Wh-從句的語法功能除了和that-從句一樣外,還可充當介詞賓語、賓語補語和間接賓語等,例如:

主語: How the book will sell depends on its author. 書銷售如何取決于作者本人。

直接賓語:In one's own home one can do what one likes. 在自己家里可以隨心所欲。

間接賓語:The club will give whoever wins a prize. 
俱樂部將給得勝者設獎。

表語: My question is who will take over president of the Foundation. 我的問題是誰將接任該基金會主席職位。

賓語補足語:She will name him whatever she wants to. 她高興給他起什么名字就取什么名字。

同位語:  I have no idea when he will return. 
我不知道他什么時候回來。

形容詞賓語:I'm not sure why she refused their invitation.  我尚不能肯定她為什么拒絕他們的邀請。

介詞賓語: That depends on where we shall go. 
那取決于我們?nèi)ツ膬骸?br>
2)Wh-從句作主語也常用先行詞it做形式主語,而將wh-從句置于句末,例如:
 It is not yet decided who will do that job. 
 還沒決定誰做這項工作。
 It remains unknown when they are going to get married.  他們何時結婚依然不明。