| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] what [adv] [verb] to | 8 |
|
| 2 | [adv] what [adv] [vb past] to | 7 |
|
| 3 | [adv] what [adv] happened [prep] | 6 |
|
| 4 | [adv] [pron] [adv] happened to | 6 |
|
| 5 | [adv] what [adv] happened to | 5 |
|
| 6 | [adv] what [adv] happen to | 5 |
|
