| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [to-vb] what happened to | 17 |
|
| 2 | [verb] [to-vb] [Wh det] happened to | 17 |
|
| 3 | [verb] [to-vb] [pron] happened to | 17 |
|
| 4 | [verb] [to-vb] what happened to | 17 |
|
| 5 | [vb infin] [to-vb] [pron] happened to | 8 |
|
| 6 | [verb] to know [pron] happened to | 7 |
|
| 7 | [verb] to see [pron] happened to | 5 |
|
