Cách sử dụng
The expression "what does...know?" is often used when someone is being critical or judgmental of someone else's opinion or comment. For example, if someone says something you disagree with or you think is wrong, you might say "what does he/she know?" This expression is used to suggest that the person doesn't have enough knowledge or experience to make an informed judgment. It's important to use this expression carefully and tastefully, as it can come across as rude or dismissive if used inappropriately.