We use why don’t (…) to make a suggestion or an offer.
Why don’t you go to the doctor?
Why don’t we buy take out today?
Imagine that a friend is making these statements.
I’m hungry!
Why don’t we go to In-N-Out? It’s on me.
It’s very cold!
Why don’t you go inside the house and grab our jackets?
I’m so tired!
Why don’t you take a nap? I can continue with the project for some minutes.
I have so much work to do!
Why don’t you start the work earlier? Then you would have more time.
I have a test tomorrow.
Why don’t we study together at the park?
I’m so bored here at home!
Why don’t you come to my place and play video games?
Take out: to take food away from a restaurant to eat it.