Help the panicked time traveler complete his diary entry by choosing the correct phrase for each gap.

If I had not tried to pet the baby T-Rex, I would not have ruined the entire space-time continuum.

If I had not tried to pet the baby T-Rex, I would not have ruined the entire space-time continuum.

To form negative third conditional sentences, we add "not" to the auxiliary verbs.

The "if" clause requires the negative past perfect (had not tried).

The main clause requires the negative conditional perfect (would not have ruined). Never put "would" in the "if" clause!