I have been studying English since I was five (对since I was five提问)

问题描述:

I have been studying English since I was five (对since I was five提问)

这个问题我也有疑问。。。
是应该问:
When did you start to study English? (你什么时候开始学英文的)
还是
How long have you been studying English?
(你学英文多久了)
我觉得都有可能呀。。

Since what time have you been studying English?

when have you been studying english?