| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] [not/n't] [verb] [Wh det] happened to | 25 |
|
| 2 | [vb base] [not/n't] [vb infin] [pron] happened to | 25 |
|
| 3 | [vb base] [not/n't] [verb] what happened to | 25 |
|
| 4 | [vb base] [not/n't] [verb] what happened to | 25 |
|
| 5 | [vb base] [not/n't] [verb] [pron] happened to | 25 |
|
| 6 | do [not/n't] [verb] [pron] happened to | 24 |
|
| 7 | [vb base] n't [verb] [pron] happened to | 22 |
|
| 8 | [vb base] [not/n't] know [pron] happened to | 21 |
|
| 9 | [vb base] [not/n't] know [pron] happened to | 21 |
|
