| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [det] [vb past] not happen | 64 |
|
| 2 | [det] [vb past] [not/n't] happen | 64 |
|
| 3 | [det] did [adv] happen | 64 |
|
| 4 | [det] [vb past] not happen | 39 |
|
| 5 | this [vb past] [adv] happen | 36 |
|
| 6 | that [vb past] [adv] happen | 28 |
|
| 7 | [det] [vb past] n't happen | 25 |
|
