| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [to-vb] at [art] time [Wh adv] | 14 |
|
| 2 | [to-vb] at [art] time [adv] | 14 |
|
| 3 | [to-vb] at [art] time when | 14 |
|
| 4 | [to-vb] at [art] time when | 14 |
|
| 5 | [to-vb] at a time [adv] | 10 |
|
| 6 | [to-vb] at a time [adv] | 10 |
|
