| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] what happened [prep] [noun] | 15 |
|
| 2 | [adv] what [verb] to [noun] | 13 |
|
| 3 | [adv] [pron] happened to [noun] | 10 |
|
| 4 | [adv] what happen to [noun] | 10 |
|
| 5 | [adv] [Wh det] happened to [noun] | 9 |
|
| 6 | [adv] what [vb past] to [noun] | 9 |
|
| 7 | [adv] what happened to [noun] | 8 |
|
| 8 | [adv] what happened to [noun] | 7 |
|
