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?

How long have they lived here?

Since when have they lived here?

How long have been
问题:他们在这里住多久了?

when do they live here?