| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh adv] it happened | 99 |
|
| 2 | how it happened | 62 |
|
| 3 | why it happened | 25 |
|
| 4 | where it happened | 7 |
|
| 5 | when it happened | 5 |
|
