I don't know when I should use "Did you were..." and when I should use "Were you...".
For example, Why do we say:

"Were you at home last night?"

but not

"Did you were at home last night?"

  • A more challenging question—because it doesn't involve running afoul of grammatical rules governing how to indicate that something happened in the past without over-identifying it as past—might be "Why isn't 'Did you be at home?' a standard alternative way of inquiring about whether someone was at home at a particular time in the past?"
    – Sven Yargs
    Dec 20 '15 at 19:36

You would never use "Did you were" in proper English, because "did" is the past tense of "do," a verb. Example: "I did my homework last night." Also, you could correctly ask, "Did you stay home last night?" instead of "Were you home last night?" Both are acceptable usage.

  • I agree with Mark. I've never heard "Did you were" used in informal/idiomatic English, either. I would call that a grammatical error.
    – Duncan C
    Dec 20 '15 at 20:43

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