| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] know what happened to | 5 |
|
| 2 | [adv] know [Wh det] happened to | 5 |
|
| 3 | [adv] know [pron] happened to | 5 |
|
| 4 | [adv] know what happened to | 5 |
|
