| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | that [verb] n't happen | 13 |
|
| 2 | [that] do n't happen | 13 |
|
| 3 | [that] did n't happen | 6 |
|
| 4 | [that] [vb past] n't happen | 6 |
|
| 5 | [that] [vb -s] n't happen | 5 |
|
| 6 | [that] does n't happen | 5 |
|
