He has been there for six months 和 My brother has never been abroad before.这2个句中为什么要加BEEN?FOR起什么作用呢》?
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![He has been there for six months 和 My brother has never been abroad before.这2个句中为什么要加BEEN?FOR起什么作用呢》?](/uploads/image/z/7841345-41-5.jpg?t=He+has+been+there+for+six+months+%E5%92%8C+My+brother+has+never+been+abroad+before.%E8%BF%992%E4%B8%AA%E5%8F%A5%E4%B8%AD%E4%B8%BA%E4%BB%80%E4%B9%88%E8%A6%81%E5%8A%A0BEEN%3FFOR%E8%B5%B7%E4%BB%80%E4%B9%88%E4%BD%9C%E7%94%A8%E5%91%A2%E3%80%8B%3F)
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