| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] happened to | 866 |
|
| 2 | [Wh det] [adv] happened | 190 |
|
| 3 | [adv] happened to | 122 |
|
| 4 | [Wh det] [adv] to | 9 |
|
