A. You have had five cans of beers since you have been sitting.
A. I have got three injuries since I have been in the Army.
Correct?
Since requires a fixed point in time; "have" here doesn't tell you that, "You have had five cans of beer since you sat down/ you came here/ you started drinking " - the point when the person sat down is that fixed point in time that "since" demands here. Another example - A thing has been happening ever "since" something happened. One more- It's been three years since the time I last met you.
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Since requires a fixed point in time; "have" here doesn't tell you that, "You have had five cans of beer since you sat down/ you came here/ you started drinking" - the point when the person sat down is that fixed point in time that "since" demands here. Another example - A thing has been happening ever "since" something happened. One more- It's been three years since the time I last met