| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] not [pron] [verb] | 139 |
|
| 2 | [is] [adv] [pron] happen | 100 |
|
| 3 | [be] not [pron] happen | 14 |
|
| 4 | [is] not [pron] happen | 13 |
|
| 5 | [is] [not/n't] [pron] happen | 13 |
|
