have,has,have been,has been在什么情况下用啊?????

如题所述

have是现在式(we have, you have, they have)
has也是现在式(he has, she has, it has)
have been (i have been living in this town for two years )我在这座城市住了两年(现在也还在住)
has been 同上一个(he has been living...)
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