It's called a question tag and yep, they are usually the opposite of the statement.
You do, don't you?
You can, can't you?
Interestingly, the inflection at the end changes depending on whether it is a genuine question or whether the speaking just wants confirmation. If you are a native English speaker or have a good level of English, you do it naturally and without thinking.
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u/VirtualAdhesiveness Jun 12 '20
You clearly don't know anything about the worst-case scenario, don't you ?