| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [not/n't] [vb infin] what happened [prep] | 10 |
|
| 2 | [vb mod] [not/n't] [vb infin] what happened [prep] | 10 |
|
| 3 | [vb mod] [not/n't] [vb infin] [pron] happened [prep] | 10 |
|
| 4 | [vb mod] [not/n't] [vb infin] [Wh det] happened [prep] | 10 |
|
| 5 | [vb mod] n't [vb infin] [pron] happened [prep] | 6 |
|
| 6 | [vb mod] [not/n't] [vb infin] [pron] happened to | 5 |
|
| 7 | [vb mod] [not/n't] [vb infin] [pron] happened to | 5 |
|
