I want a change for my five pound note,please.

题目

I want a change for my five pound note,please.
请问,能否改成:I want to change for my five pound note,please.
want a 和want to用法上有什么区别,什么情况下可以互换?

答案

I want to change my five pound note,please这样就行了
这句是want + a change,而不是 want a + change
want a只是want后面加可数名词而已,意为 ：想要什么
want to + 动词 意为 ： 想做什么
两个没什么联系