Help the frustrated roommate express their preference politely but firmly by choosing the correct verb phrase.

"I know you love your seafood, but I'd rather you _____ fish in our shared microwave."

The correct answer is didn't cook.

When we use "I'd rather" to express a preference about someone else's actions in the present or future, we use the past tense (the "unreal" past or subjunctive mood). Even though the roommate is talking about a present habit, "didn't cook" is the grammatically correct choice!