Should I say "When did you born?" or "When were you born?"?
closed as off-topic by Mari-Lou A, Hellion, Kristina Lopez, choster, tchrist♦ Sep 11 '15 at 23:10
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"When were you born?" is the correct version. A simple rule of thumb would be to replace it with a similarly formed verb. Born is past participle, so we could replace it with written.
"When did you written?" No. "When were you written?" Yes, if you were a book, and grammatically correct.