| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] happened to | 866 |
|
| 2 | [adv] [Wh det] happened | 303 |
|
| 3 | [adv] happened to | 122 |
|
| 4 | [adv] [Wh det] to | 6 |
|
