| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] has [not/n't] happened | 31 |
|
| 2 | [pers pn] has [not/n't] happen | 28 |
|
| 3 | it has [not/n't] happen | 28 |
|
| 4 | it has [not/n't] happen | 28 |
|
| 5 | [pron] has n't happen | 23 |
|
| 6 | [pron] has not happen | 8 |
|
