| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | that do n't happen | 36 |
|
| 2 | that [vb past] n't happen | 17 |
|
| 3 | that did n't happen | 17 |
|
| 4 | that does n't happen | 15 |
|
| 5 | that [vb -s] n't happen | 15 |
|
