| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] it [modal v] happen [prep] | 6 |
|
| 2 | [vb past] it would happen [prep] | 6 |
|
| 3 | [vb past] it would happen [prep] | 6 |
|
| 4 | [vb past] it [vb mod] happen [prep] | 6 |
|
