问题标题：
【1.对“since+从句”提问用howlong吗?例：Hehasworkedatthefactorysincehecamehere.对sincehecamehere.该怎么提问?2.对“since+时间段+ago”提问用howlong吗?例：Ihavebeenheresince2yearsago.对since2yearsago.】
问题描述：
1.对“since+从句”提问用howlong吗?
例：Hehasworkedatthefactorysincehecamehere.
对sincehecamehere.该怎么提问?
2.对“since+时间段+ago”提问用howlong吗?
例：Ihavebeenheresince2yearsago.
对since2yearsago.该怎么提问?
李燕宁回答：
1Howlonghasheworkedatthefactory?
2Howlonghaveyoubeenhere?
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