| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] happened to | 866 |
|
| 2 | [noun sg] [Wh det] happened | 117 |
|
| 3 | [noun sg] [Wh det] to | 103 |
|
| 4 | [noun sg] happened to | 87 |
|
