| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] happened when | 84 |
|
| 2 | what happened when | 81 |
|
| 3 | what happened when | 81 |
|
| 4 | [pers pn] happened when | 15 |
|
| 5 | it happened when | 14 |
|
| 6 | it happened when | 14 |
|
