I always needed time on my own 介词为什麽是on?

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I always needed time on my own 介词为什麽是on?

on one's own 是固定搭配,句中作后置定语修饰time
而另一固定搭配by one's own则作状语修饰动词
例如:He bought the car by his own choice 他根据自己的决定买了这辆车