| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] what happened to [pron] | 32 |
|
| 2 | [adv] what [verb] to [pron] | 30 |
|
| 3 | [adv] what happen to [pron] | 28 |
|
| 4 | [adv] [pron] happened to [pron] | 23 |
|
| 5 | [adv] what happened [prep] [pron] | 23 |
|
| 6 | [adv] what [vb past] to [pron] | 21 |
|
| 7 | [adv] [Wh det] happened to [pron] | 21 |
|
| 8 | [adv] what happened to [pron] | 21 |
|
