| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] what [verb] to | 660 |
|
| 2 | [prep] what [vb past] to | 345 |
|
| 3 | [prep] what happened [prep] | 226 |
|
| 4 | [prep] what happened [prep] | 226 |
|
| 5 | [prep] what happen to | 145 |
|
| 6 | [prep] [pron] happened to | 92 |
|
| 7 | [prep] what happened to | 85 |
|
