Complete the conversation between two friends planning their weekend. Choose the correct phrases to form negative questions.

"I'm so bored, so why don't we go to that new alien-themed cafe downtown?"

"That sounds fun, but isn't it supposed to be really expensive?"

"I'm so bored, so why don't we go to that new alien-themed cafe downtown?"

"Why don't we + [base verb]" is a very common negative question structure used to make friendly suggestions.

"That sounds fun, but isn't it supposed to be really expensive?"

We use the "to be" verb ("isn't") with the phrase "supposed to be." Negative questions are often used to confirm something you think is true.