| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] na happen when | 7 |
|
| 2 | gon [prep] happen when | 7 |
|
| 3 | [v-ing] na happen when | 7 |
|
| 4 | [v-ing] [to] happen when | 7 |
|
