| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [vb -s] not happen | 12 |
|
| 2 | [adv] does [adv] happen | 12 |
|
| 3 | [adv] [vb -s] [not/n't] happen | 12 |
|
| 4 | [adv] [vb -s] n't happen | 8 |
|
| 5 | just [vb -s] [adv] happen | 6 |
|
