| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] did [adv] happen | 19 |
|
| 2 | [adv] [vb past] [not/n't] happen | 19 |
|
| 3 | [adv] [vb past] not happen | 19 |
|
| 4 | [adv] [vb past] n't happen | 11 |
|
| 5 | just [vb past] [adv] happen | 8 |
|
| 6 | [adv] [vb past] not happen | 8 |
|
| 7 | certainly [vb past] [adv] happen | 5 |
|
