| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | n't [vb infin] what happened to | 34 |
|
| 2 | n't [vb infin] what happened to | 34 |
|
| 3 | n't [vb infin] [Wh det] happened to | 34 |
|
| 4 | n't [vb infin] [pron] happened to | 34 |
|
| 5 | n't know [pron] happened to | 21 |
|
| 6 | n't care [pron] happened to | 5 |
|
