PLACE › used to show the place or position of something or someone: We met at the station. She was sitting at the table. She's at the library.
TIME › used to show the time something happens: The meeting starts at three.
DIRECTION › towards or in the direction of: She threw the ball at him. He's always shouting at the children.
ABILITY › used after an adjective to show a person's ability to do something: He's good at making friends. I've always been useless at tennis.
CAUSE › used to show the cause of something, especially a feeling: We were surprised at the news.
AMOUNT › used to show the price, speed, level, etc of something: He denied driving at 120 miles per hour.
ACTIVITY › used to show a state or activity: She was hard at work when I arrived. a country at war
INTERNET › the @ symbol, used in email addresses to separate the name of a person, department, etc from the name of the organization or company