※ 引述《DreamerSun (都利姆桑)》之銘言：
: 前輩好！
: 小弟最近對於以下文法卡好久，一直想不通，
: A) I will show him who is the boss.
: B) I don't know who he is.
: 請問這兩句 who 後面的動詞位置不一樣的原因是？
: 為何 A) 不是 who the boss is?
: 謝謝大家！

可以直接看上色圖片版https://i.imgur.com/tVl72P0.jpg

因為懶得在BBS裡上色XD

以下是文字版
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A) I will show him who is the boss.
B) I don't know who he is.

1.這兩句的都是名詞子句。

2. I will show him who is the boss.這句後面的who is the boss並沒有倒裝，因為
who本來就是主詞，誠如s831111所說的：
問：Who（主詞）is the boss?
答：Tom（主詞）is the boss.
----

參考
Practical English Usage 3rd. 278.7

Questions beginning "who/what/which + be" can ask for a subject or a
complement. Compare:
以who ;what ; which+ be 開頭的疑問句可就主語或補語進行提問。試比較：

Who is the best player here? 誰是這兒最好的選手？
(This asks for a subject: a possible answer is John is the best player here.)
（這是就主語進行提問：可能的回答是John is the best player here）

What is the time?
(This asks for a complement: a possible answer is The time is 4.30, NOT 4.30
is the time.)
（這是就補語進行提問：可能的回答是The time is 4.30，不能說：4.30 is the time.)

When we report the first kind of question (where "who/what/which + be" asks for
a subject), two word orders are possible.
在轉述第一種疑問句（這裏的who / what / which + be 就主語進行提問）時，有兩種可
用的詞序。

DIRECT:
Who's the best player here?

INDIRECT:
She asked me who was the best player.
She asked me who the best player was.

DIRECT:
What's the matter?

INDIRECT:
I asked what was the matter.
I asked what the matter was.

DIRECT:
Which is my seat?

INDIRECT:
She wondered which was her seat.
She wondered which her seat was.

This does not happen when "who/what/which" asks for a complement.
當who/what/which 就補語進行提問時，則只能有一種語序：

DIRECT:
What's the time?

INDIRECT:
She asked what the time was. (NOT USUALLY She asked what was the time.)
（通常不能說：She asked what was the time.)
----
回到本題：

※I will show him who is the boss.

這句的問句是who is the boss? 明顯問的是「問句中的主詞/主語who」，回答可能是
Tom (is the boss.)（因為這個問句中的主詞在回答時也是主詞，因此寫成間接問句時，
語序就不需要變動，本來就是「主詞+動詞」的順序。）

不過若照Practical English Usage的說法，問「主詞/主語」時，可以有兩種間接問句寫
法：
I will show him who is the boss.
I will show him who the boss is.

※I don't know who he is.

這句的問句是Who is he? 問的是「問句中的主詞補語he」，回答可能是He is the
boss. （因為這個問句中的主詞補語he，在回答時變成主詞了，因此寫成間接問句時，語
序需要變動，要把he放到is前面，寫成I don't know who he is.這樣才是「主詞+動詞」
的順序，而who在這裡就是名詞子句連接詞）

照Practical English Usage的說法，問主詞補語時只能有一種寫法：I don't know who
he is.

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