Cách sử dụng
The expression "check in" is commonly used when traveling or staying somewhere overnight. It means to confirm your arrival at a location or accommodation.For example, when you arrive at a hotel, you would go to the front desk and "check in" by giving your name and showing your ID. This lets the hotel staff know that you have arrived and are ready to be checked into your room.Likewise, when traveling by plane, you would "check in" at the airport by giving your ticket and any necessary documents to the airline staff. This lets them know that you are ready to board your flight and ensures that your seat is reserved.In general, "check in" means to officially announce your arrival somewhere, either to get access to something or to start participating in something.