Since the beginni n g of the last week, I have tried telephoning you ( so ) many times .
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Mohamadreza0Sth which makes me confused for using present perfect is that we`re not supposed to use a definite date with it, here in the mentioned example "beginning the last week" can`t be taken as a definite date?That is not a true statement. With a "since" clause, we can use past markers. i.e. I have been a Beatles fan since I was 10 years old ( you are 25