I used to be rather quite when I was young,为什么用when?

问题描述:

I used to be rather quite when I was young,为什么用when?
I used to be rather quite when I was young,为什么用when?be young 是瞬间动词?

当我年轻的时候,这是一个时间点,或者一个时间段,一般有关时间的都用when