| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] not [adv] happen | 9 |
|
| 2 | do [adv] [adv] happen | 9 |
|
| 3 | [vb base] [not/n't] [adv] happen | 9 |
|
| 4 | [vb base] n't [adv] happen | 7 |
|
| 5 | [vb base] [adv] just happen | 5 |
|
