| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] what happened to | 208 |
|
| 2 | [to-vb] what [verb] to | 116 |
|
| 3 | [to-vb] what [vb past] to | 55 |
|
| 4 | [to-vb] what happened [prep] | 50 |
|
| 5 | [to-vb] what happen to | 44 |
|
| 6 | [to-vb] [pron] happened to | 27 |
|
