She's had the flu since last Thursday. She had the flu since last Thursday. -- No; the first suggests she still has the flu, but the second does not.
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AnonymousShe's had the flu since last Thursday.She had the flu since last Thursday.Only the first sentence is right.
AnonymousWe have had to work late three times last week.We had to work late three times last week.Only the second sentence is right as last week is over.
AnonymousPast and Perfect Ten