| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] what [adv] happened to | 5 |
|
| 2 | what [adv] happened to [pron] | 9 |
|
| 3 | what [adv] happened to [pers pn] | 7 |
|
| 4 | what [adv] happened to [noun] | 5 |
|
