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Hi ,
I understood that "was" and "has been" are confusing areas of tenses . But it is very easy to understand ," was"is an action of past and end . But "has been" is not an ending action and it's past is "had been".
Example:1) food has been prepared
2) Food had been prepared
1)"food" is not ready yet,it and continued the action till the present. So it is not a stopped action.so from a specific time to the current moment it is happening.
2) had been is the past of has been .so if we continued doing something but now not doing it and stopped doing it before the current moment it can be taken as had been. It means that,now the action is stopped but we can mention or remember a time from past that was happening or did.

And main thing is this is passive voice explained here,so no importance of a doer here.

"Was" also used in passive voice for past actions. Was is used to explain an action which is not happening now. So it is an action which is not connected with the current moment.and it's can be accepted as an end of something and it has no relationships with now. And it will not mark the time too.
AnonymousExample:1) food has been prepared 2) Food had been prepared 1)"food" is not ready yet,it and continued the action till the present.
No, you have an incomplete understanding of the present perfect. It depends on the verb and its context:

Food has been prepared = the preparation is recently complete
I have lived in Japan = past experience; I no longer live there.
I have lived in Japan for 10 years = I may or may not still be living there.
I have been living in Japan for 10 years= I still live there.
Anonymous2) had been is the past of has been .so if we continued doing something but now not doing it and stopped doing it before the current moment it can be taken as had been. It means that,now the action is stopped but we can mention or remember a time from past that was happening or did.
That also is incorrectly conceived. Past perfect refers to the earlier of two past actions whose order of occurrence is otherwise unclear; it is also used occasionally for emphasis of a completed past action.

I ate dinner when she arrived vs I had eaten dinner when she arrived.— To avoid ambiguity
I ate / had eaten dinner before she arrived.— to emphasize the completed meal
Anonymous"Was" also used in passive voice for past actions. Was is used to explain an action which is not happening now. So it is an action which is not connected with the current moment.and it's can be accepted as an end of something and it has no relationships with now. And it will not mark the time too.
I will not even attempt to disambiguate that.
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Mister MicawberI will not even attempt to disambiguate that.
I didn't even attempt to disambiguate the first part, either.
Good work!
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when we use was and has?

ex1: i has completed?

ex2: i was completed?

which one is correct.....
Anonymouswhich one is correct..
Both are wrong.

I have completed my task.
My task was completed at 5 pm.
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That was pretty comprehensive.

Thank you.