Cách sử dụng
The expression "on/off duty" is often used to describe someone's work schedule. When someone is "on duty," it means they are working or responsible for doing their job. When someone is "off duty," it means they are not working and can do other things. For example, a police officer might be on duty when they are patrolling the streets, but when their shift is over, they are off duty and can go home. It's important to understand this expression if you work a job where you have specific work hours and responsibilities.