Complete the time traveler's frantic diary entry by choosing the correct phrase for each blank.

The timeline is completely ruined! Furthermore, had I not forgotten my emergency repair manual, I could have fixed the portal by now.

The timeline is completely ruined! Furthermore, had I not forgotten my emergency repair manual, I could have fixed the portal by now.

In third conditional sentences, we can drop "if" and invert the subject and the auxiliary verb "had" (Had I known...).

For negative sentences, the "not" must separate from the auxiliary verb and come after the subject (Had I not forgotten...). Using the contraction (Hadn't I...) is grammatically incorrect in standard conditional inversion.

Because this is an unreal past condition with a present/past result, the result clause requires a modal perfect like "could have" to match the past participle "fixed."