| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] not [v-ing] [prep] happen | 5 |
|
| 2 | be not [v-ing] [prep] happen | 5 |
|
| 3 | [be] not [v-ing] [prep] happen | 5 |
|
| 4 | 's not [v-ing] [prep] happen | 5 |
|
