| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [not/n't] [verb] what happened to [noun] | 6 |
|
| 2 | [not/n't] [verb] [pron] happened to [noun] | 6 |
|
| 3 | [not/n't] [vb infin] [pron] happened to [noun] | 6 |
|
| 4 | [not/n't] [verb] [Wh det] happened to [noun] | 6 |
|
| 5 | n't [verb] [pron] happened to [noun] | 6 |
|
| 6 | [not/n't] [verb] what happened to [noun] | 6 |
|
