I wanted any other mother...

它是'' I wanted any other mother but not you''。
「我寧願要其他人做我的媽媽，也不要你...」正正就是這樣說。

反過來說「我不要誰來做我媽媽，除了你。」，則應是I don’t wanted any other mother but you。
“I wanted any other mother but you” － 唔make sense
“I don’t want any other mother but not you” － 唔make sense

But: (except)除...以外
No one saw it but me.
除了我沒有人看到。

I wanted any other mother but you
我寧願要其他人做我的媽媽，除了你。

首先你要知道but是preposition.是解:除.x..x..以外./ 不是conj.解:但是,而是.

I wanted any other mother [ but you ..是prepositional phrase.=除咗你之外.].....咁你而家明啦!

2010-05-30 07:46:59 補充：
有首歌就係話:

I want nobody nobody.........=我想要的是nobody=冇人....=冇人是我想需要的.
..................................................................................=I have no money.

but you..............................=除了你之外(冇任何人是我想的.)

2010-05-30 07:49:41 補充：
=我只要你............正正是!