| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | do not know what happened to | 24 |
|
| 2 | do not know what happened to | 24 |
|
| 3 | do not know [Wh det] happened to | 24 |
|
| 4 | do not know [pron] happened to | 24 |
|
| 5 | do not know [pron] happened to | 21 |
|
| 6 | do n't know [pron] happened to | 21 |
|
