| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] at [det] time | 143 |
|
| 2 | which at [det] time | 38 |
|
| 3 | which [vb past] at [det] | 20 |
|
| 4 | which [vb past] [det] time | 10 |
|
