| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] know [Wh det] happened to | 29 |
|
| 2 | [adv] [verb] [Wh det] happened to | 16 |
|
| 3 | [adv] know [Wh det] [verb] to | 9 |
|
| 4 | [adv] know [Wh det] happened [prep] | 7 |
|
| 5 | [adv] know [Wh det] [vb past] to | 6 |
|
| 6 | [adv] know [pron] happened to | 5 |
|
| 7 | [adv] know [Wh det] happen to | 5 |
|
