1.对“since+从句”提问用how long吗?
问题描述：
1.对“since+从句”提问用how long吗?
例：He has worked at the factory since he came here.
对since he came here.该怎么提问?
2.对“since+时间段+ago”提问用how long吗?
例：I have been here since 2 years ago.
对since 2 years ago.该怎么提问?
答
1 How long has he worked at the factory?
2 How long have you been here?