| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] at [art] time | 398 |
|
| 2 | which [vb past] at [art] | 145 |
|
| 3 | which at [art] time | 58 |
|
| 4 | which [vb past] [art] time | 9 |
|
