I have been studying English since I was five (对化线部分提问)前面有2个空
问题描述：
I have been studying English since I was five (对化线部分提问)
前面有2个空
答
How long have you been studying English?
答
I have been studying English since I was five
你没有划线,我举了几个例子……
1、when have you been studying English
2、what have you done since you were five
what have I done since I was five
3、what have I/you been studying since I/you was/were five