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Complete the sleepy roommate's morning realization.
"Wait a minute... _________________________ buy coffee yesterday? I could have sworn I saw a bag in your hands!"
"Oops, that was actually cat food. Well, _________________________ just go to the café down the street instead of panicking?"
"Wait a minute... Didn't you buy coffee yesterday?"
We use negative questions like Didn't you to express surprise or to check if an assumption is true. In informal English, the contraction n't always attaches to the auxiliary verb before the subject. "Did not you" is grammatically incorrect (it would need to be "Did you not").
"Well, why don't we just go to the café down the street instead of panicking?"
The phrase Why don't we...? is a very common negative question used to make a friendly suggestion.