I have been studying English for four years.就for four years提问
问题描述:
I have been studying English for four years.就for four years提问
答
How long have you been studying English?
how long 提问时间长短
答
How long have you been studying English for?
答
就 for 加时间段的短语的提问,应用表示时间段的疑问词进行提问
即:How long
所以句子应为:How long have you been studying English?
答
How long have you been studying English?