0 used to show an exact position or particular place: --
1 used to show an exact or a particular time: --
2 in the direction of: --
3 used to show the cause of something, especially a feeling: --
4 used to show the activity in which someone's ability is being judged: --
She's hopeless at organizing things.
He's very good at getting on with people.
I was never very good at sports.
5 the @ symbol that joins the name of a person or a department in an organization to a domain name to make an email address: --
Of the ten men who escaped this morning from Dartmoor Prison, only two are still at liberty .
He felt completely at ease.
Water boils at 212° Fahrenheit and 100° Celsius/Centigrade.
With inflation at 500%, the country faces a crisis of confidence.
When you buy a new computer, you usually get software included at no extra cost .