| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at [art] time [Wh adv] | 1608 |
|
| 2 | at [art] time when | 1607 |
|
| 3 | at a time [Wh adv] | 1344 |
|
| 4 | at the time [Wh adv] | 275 |
|
| 5 | at [art] times [Wh adv] | 11 |
|
| 6 | at [art] time how | 6 |
|
