is 代表从现在追溯到过去的那个时间.而has been was 代表从过去的某一时间追溯到过去的过去的某一时间.had been句子中必需还要有一个过去的时间,指的是从从过去的这个时间之前的某个时间之前追溯到更久的一个时间.
可能讲的有点乱.如果不大懂,再补充提问下吧.
补充：可能 正如你所说“has been was 和is 没什么区别”,这我有点糊涂了.你可以先照你原来的理解.
关于两者的区别,我个人感觉强调句没有用since的吧.貌似都是用that的吧.
It is /was +时间+ since… 其中is has been was had been.与强调句的区别
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