Showing time
| at a specific time: at 7:20, at dawn, at dinner | |
| on a specific day or date: on Tuesday, on June 4 | |
| in a part of a 24-hour period: in the afternoon, in the daytime [but at night] | |
| in a year or month: in 2008, in July | |
| in a period of time: finished in three hours |
Showing place
| at a meeting place or location: at home, at the club | |
| at the edge of something: sitting at the desk | |
| at the corner of something: turning at the intersection | |
| at a target: throwing the snowball at Lucy | |
| on a surface: placed on the table, hanging on the wall | |
| on a street: the house on Spring Street | |
| on an electronic medium: on television, on the Internet | |
| in an enclosed space: in the garage, in an envelope | |
| in a geographic location: in San Diego, in Texas | |
| in a print medium: in a book, in a magazine |