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How long has he worked here? 他已经在这工作 多久了 ?
He has worked here for ten years.他已经在这工作十年了。
物体 的长度
How long is this desk?这张书桌有多长?
How often 多经常(问频度)
How often do you go swimming ?你多久去游一次泳?
how soon 还要多久,是对从某个基本时间到将来某动作结束或某动作发生这段时间提问,常用在一般将来时态的句子中,其答语通常用in+一段时间
How soon can you finish the work?还要多久你能完成这项工作?
当现在完成时描述发生在过去且一直延续到现在的动作时,一般和“for+一段时间”或“since+某个时间点”连用。
How long has lucy l ived in this house?
He has lived here for ten years.
He has lived here since 1982.