Thank you for your comments, Vince. I share the same thought as you.
I came across someone using past tense like the example as follows and I wonder if it's grammatical.
A: 1 + 1 = 11
B: You *were* wrong.
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If anyone thinks otherwise, please feel free to comment.
Very often, contract form is used in conversational English, like it's, we're, you're, etc. And it makes it difficult for English learner like me to understand if the statement is referring to past or present tense.
Thanks.
Kit