Aren’t you going to (do something)?
When someone should do something, but it seems like they aren’t going to, you might say “Aren’t you going to ___?”
Aren’t you going to say thank you?
Aren’t you going to tell her we can’t come?
Although this phrase has the form of a question, it’s more of a command. You wouldn’t want to say this to anyone you don’t know well. It shows some disapproval and is rather direct.
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