have done for/since和have been doing for/since区别

i have lived in us for 2 months
i have been living in us for 2 months
i have lived in us since 2 months ago
i have been living in us since 2 months ago
能翻译一下吗？这四句望大侠帮小弟解惑谢谢~~~~~~~~~
小弟实在是没财富只能说声谢谢谢谢再谢谢了~~~

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推荐答案 2011-01-04

have done for/since和have been doing for/since
完成时，表示动作结束了||||完成进行时，动作还在继续。
i have lived in U.S. for 2 months
我已经住在美国2个月,说话时为止有两个月。
i have been living in U.S. for 2 months
2个月来我一直生活在美国——并将继续下去一段时间。
i have lived in U.S. since 2 months ago
2个月前我就已经住在了美国。
i have been living in U.S. since 2 months ago
2个月前我就一直生活在美国————并将继续下去一段时间。

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