To me, (1) seems the most usual and idiomatic, then (2) and then (3). I think it is possible that someone might say (3), but I wouldn't recommend that you use it yourself. If you want to use any of these, I would recommend (1).
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teacherJapanI think 3 is ungrammatical, but is my understanding correct?It doesn't seem grammatical to me, though I'm sure some people say it occasionally.