How do we know what she says is false? How do we know that she is a person? How do we know that China is a country? How do we know what a tweet is? You're r

How do we know what she says is false? How do we know that she is a person? How do we know that China is a country? How do we know what a tweet is? You're right. There are many assumptions we can make here. Can you say why you chose that particular point of abstraction?