Help Dr. Oops complete his slightly embarrassing lab report by dragging the right verb forms to the gaps.

As a basic rule of physics, if you heat ice, it melts immediately. Unfortunately, if I had remembered to close the lab freezer yesterday, my expensive ice cream cake would not have turned into a sad puddle!

As a basic rule of physics, if you heat ice, it melts immediately.

This is a Zero Conditional sentence. We use "if + present simple" (heat) and the "present simple" (melts) in the main clause to state general truths or scientific facts.

Unfortunately, if I had remembered to close the lab freezer yesterday, my expensive ice cream cake would not have turned into a sad puddle!

This is a Third Conditional sentence. We use "if + past perfect" (had remembered) and "would have + past participle" (would not have turned) to talk about a hypothetical situation in the past and its imaginary past result.