Why does も move in sentences involving だれも etc


> 丸尾君はだれに頼まれたわけで **も** ないのに、ひとりで教室の拭きそうじをしていた。  
>  Although it's not the case that Maruo was asked by anyone, he did the
> classroom cleaning by himself.

...わけではない = It's not the case that ...  
だれも = anyone

I'm confused as to how these merge together into the above sentence (assuming
my translation is correct).

Naively (and no doubt wrongly) I would have tried だれに **も** 頼まれたわけで **は**
ないのに. Is there a way to understand what is going on here?

Also, If I simply wanted to say "I wasn't asked by anyone" (without all the わけ
stuff) how would I do that? Again, naivley I'd try だれに **も** 頼まれなかった、but
something tells me I'm wrong.




The も moves because 誰も is not a single word; it is two words. The も is the
very same as in 私もそう思う.

The combination of a question _phrase_ and も becomes 'any~~~'; for example,
you could say

> 誰のせい？  
>  Whose fault is it?

Someone may answer

> 誰のせいで **も** ない  
>  It's no one's fault.

You may be familiar with ～ても 'even if'; combining this with a question word
results in 'no matter', as in

> 例えこの先何があっても、僕達は友達でいよう。  
>  No matter what happens, we will always be friends.

I don't know if that's a satisfactory answer, but I hope it at least helps you
somewhat.

