谁能帮忙解答一下难题么。。。have/has + been +since表示过去并持续到现在，那么不加since，只是h

have/has + been +since表示过去并持续到现在，那么不加since，只是have been 是不是意思一样呢？

I have received from my brother 跟 I have been received from my brother。 I have already typed it 与I have been typed it .有什么区别？

the patient had been dead / the patient had dead / the patient has been dead / the patient has dead 。每个表达的都是什么意思？

现在完成时与一般过去时以及过去完成时，简直分不清楚了，能帮忙通俗的打比方来形容他们之间的关系，以及向表达什么样的意思用哪一个时态吗？