| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] n't [adv] | 3147 |
|
| 2 | [vb past] [adv] happen | 209 |
|
| 3 | [vb past] n't happen | 110 |
|
| 4 | n't [adv] happen | 39 |
|
