| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] [adv] [vb past] [verb] | 249 |
|
| 2 | [Wh det] [adv] [verb] happen | 23 |
|
| 3 | [pron] [adv] [vb past] happen | 16 |
|
