| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [verb] what happened to | 25 |
|
| 2 | [vb past] [verb] what [verb] to | 13 |
|
| 3 | [vb past] [verb] what [vb past] to | 11 |
|
| 4 | [vb past] [verb] what happened [prep] | 6 |
|
| 5 | [vb past] [verb] what happened [prep] | 6 |
|
| 6 | [vb past] [verb] what happen to | 5 |
|
| 7 | [vb past] [verb] what happened to | 5 |
|
| 8 | [vb past] [verb] [Wh det] happened to | 5 |
|
| 9 | [vb past] [verb] what happened to | 5 |
|
| 10 | [vb past] [verb] [pron] happened to | 5 |
|
