| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] what [verb] to | 97 |
|
| 2 | [adv] what happened [prep] | 79 |
|
| 3 | [adv] what happen to | 64 |
|
| 4 | [adv] what happened to | 57 |
|
| 5 | [adv] [pron] happened to | 54 |
|
| 6 | [adv] what [vb past] to | 51 |
|
