I am coming
He has alread gone.
have done to 去了还没有回来have been to 去了已经回来了
He was back yesterday
To not come back To have been back
I'm back .He is back.
直接He is back. 就可以。 如果是He was back. 的话，是他过去回来了。强调讲过去的事儿。
He had come by yesterday.
He has been back yesterday.
He is back 或者he comes back
He has gone.
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一个胖子0528
