'But if they're be still here' is incorrect. It is perhaps a typo.
'They're' can only be 'they are'. 'They are be' does not exist. ('They were be' does not exist either.)
March 5, 2023
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"They're" is a contraction of "they" and "are." There is no contraction for "there" and "were."
Also: Your example isn't a sentence, but rather a dependent clause. And you shouldn't ever use "be" after either "are" or "were."
March 5, 2023
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You can say these things:
If they are still here...
If they will be still here...
If they were still here...
March 5, 2023
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Thanks a lot.
March 5, 2023
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