They have lived here since my son was born 就划线部分提问划线部分 since my son was born_ _ _ they _ here?
问题描述：
They have lived here since my son was born 就划线部分提问
划线部分 since my son was born
_ _ _ they _ here?
答
How long have they lived here?
答
Since when have they lived here?
答
How long have been
问题：他们在这里住多久了?
答
when do they live here？