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what is the difference between these sentences

Since when are you responsible for that project? Is this one ok ?

Since when were you responsible for that project ?

Since when have you been responsible for that project?

I know "since when" implies some doubts
from the asker and a bit of anger in this example. In this case it means"You are working on my project and you shouldn't" Is the first sentence more general and not possible because it is a specific project that has a limited duration or have they all the same meaning .

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Since when can be used in any tense in the sense of from what time depending on the context.

Since when are you responsible for the project.?

Since when have you been responsible for the project?

Since when were you responsible for the project?

The simple past does not suit in the context because the adrdressee is no longer responsible.

The simple present with since when is used for kidding or just to show your surprise or just as an enquiry.

The present perfect with since when is used to express anger and surprise in spoken English.

So I think the correct sentence should be:

since when have you been responsible for the project? is the most appropriate question in the context you mentioned.

Here is a link which shows the use of since when.

https://www.ldoceonline.com/dictionary/since-when

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    I did not know that present perfect was used to express anger in this case, I had thought present simple was a better way to express it before i read your reply why a downvote
    – Yves Lefol
    Commented Nov 3, 2019 at 15:55
  • @ User 5577.I do not understand the reason either.please follow the link I provided and decidefor yourself. Commented Nov 3, 2019 at 15:58

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