| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [to-vb] what happened to | 27 |
|
| 2 | [to-vb] what happened to | 27 |
|
| 3 | [to-vb] [Wh det] happened to | 27 |
|
| 4 | to know [pron] happened to | 9 |
|
| 5 | to see [pron] happened to | 7 |
|
