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Complete the time-traveler's regretful diary entry by selecting ALL the grammatically correct inverted conditional phrases that fit the blank.
"________________, I would never have pressed the big red button that sent me to the Jurassic period."
The correct answers are Had I known the dinosaur was awake, Were I to have guessed the terrifying outcome, and Had I been informed about the angry T-Rex.
In formal English, we can omit "if" in unreal conditionals by inverting the subject and the auxiliary verb (usually had, were, or should).
"If had I realized" is incorrect because you cannot use both "if" and inversion together.
"Did I know" is incorrect because we do not use "did" for conditional inversion; you must use Had I known (past perfect) or Were I to know (subjunctive).