Learn what "how could you be so careless" means, when people say it, and how to use it naturally in English.

It is a criticism meaning the other person acted irresponsibly or with little attention.
From Marry The Wrong Bride, Episode 8
Someone criticizes another person for being careless.
Use this when blaming someone for a mistake. It can sound harsh, so avoid it if you want to stay polite.
Scenes unlock real expressions as you watch
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Reinforce with quick quizzes and repetition
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