| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | do n't happen | 288 |
|
| 2 | [vb -s] n't happen | 122 |
|
| 3 | does n't happen | 122 |
|
| 4 | [vb past] n't happen | 110 |
|
| 5 | did n't happen | 110 |
|
| 6 | [vb base] n't happen | 56 |
|
| 7 | do n't happen | 56 |
|
