In 'first conditional' sentences, these forms are not possible in standard varieties of English. In 'second conditionals' with HAVE and BE, inversion (with no auxiliary DO) is possible in BrE: Had I enough money, I would..., Were I rich, I would, .... However, this is not common, and sounds formal/old-fashioned. Inversion (with or without DO) is not possible with other verbs.Did I have enough money, I would buy that car.
Do I have enough money, I will buy that car.This is possible in third conditional sentences.Had I had enough money, I would have bought that car.
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