| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [vb past] [prep] [art] time | 15 |
|
| 2 | [Wh det] [vb past] [prep] the time | 14 |
|
| 3 | [Wh det] [vb past] at [art] time | 12 |
|
| 4 | [Wh det] existed [prep] [art] time | 5 |
|
