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Complete the conversation between two hungry college students by choosing the best verb forms.
Sarah: "Wow, you ______________________________ a massive five-course meal for our study group! We already grabbed pizza on the way here!"
Mark: "Oh, well, more for me! At least I _______________________________ the kitchen beforehand, since my roommate miraculously scrubbed it this morning."
needn't have cooked
Mark actually cooked the food, but it was a wasted effort because everyone had already eaten. Needn't have done shows an action was performed but wasn't needed.
didn't need to clean
Mark didn't clean the kitchen because his roommate had already done it. Didn't need to do shows there was no obligation, so the action didn't happen.