Cách sử dụng
The word "at" is used to indicate a specific location or position in space. For example, you might say "I am at the park" to indicate that you are physically present in a park. You might also use "at" to describe the location of an event or activity, such as "She is at a concert" or "He is at work." In general, "at" is used to indicate a specific point in time or place, and can be used in a wide variety of contexts.