| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [pron] happened on | 7 |
|
| 2 | [adv] [Wh det] happened on | 7 |
|
| 3 | [adv] what happened on | 7 |
|
| 4 | [adv] what happened on | 7 |
|
