He is the only one against my idea.是不是就等于He against my idea.

问题描述:

He is the only one against my idea.
是不是就等于He against my idea.

对。against是介词,
against my idea 是介词词组作定语。相当于定语从句:He is the only one who is against my idea.

语法上是正确的,是定语从句的省略用法~

……质疑楼上的解释…………………………
不过其实怎么理解都成……这句话就是对的
我觉得against ……是介词短语做后置定语~修饰the one的……
翻译下:他是唯一一个反对我观点的人~